
<PAGE>
 
                                                                     EXHIBIT 4.2


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                           OFFSHORE LOGISTICS, INC.

                                      AND

               THE GUARANTORS NAMED ON THE SIGNATURE PAGE HERETO



                                 $100,000,000

                     7-7/8% SERIES A SENIOR NOTES DUE 2008



                         REGISTRATION RIGHTS AGREEMENT

                         DATED AS OF JANUARY 27, 1998



                           JEFFERIES & COMPANY, INC.


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<PAGE>
 
     This Registration Rights Agreement (this "Agreement") is made and entered
into as of January 27, 1998 by and among Offshore Logistics, Inc., a Delaware
corporation (the "Company"), Air Logistics, L.L.C., Air Logistics of Alaska,
Inc., Grasso Corporation, Grasso Production Management, Inc., Medic Systems,
Inc., and Pumpkin Air, Inc. (each a "Guarantor" and, collectively, the
"Guarantors"), and Jefferies & Company, Inc. (the "Initial Purchaser"), who has
agreed to purchase $100,000,000 aggregate principal amount of the Company's 
7-7/8% Series A Senior Notes due 2008 (the "Series A Notes") pursuant to the
Purchase Agreement (as defined below).

     This Agreement is made pursuant to the Purchase Agreement, dated January
22, 1998 (the "Purchase Agreement"), by and among the Company, the Guarantors
and the Initial Purchaser.  In order to induce the Initial Purchaser to purchase
the Series A Notes, the Company has agreed to provide the registration rights
set forth in this Agreement.  The execution and delivery of this Agreement is a
condition to the obligations of the Initial Purchaser set forth in Section 3 of
the Purchase Agreement.

     The parties hereby agree as follows:

SECTION 1.     DEFINITIONS

     As used in this Agreement, the following capitalized terms shall have the
following meanings:

          Act:  The Securities Act of 1933, as amended.

          Advice:  As defined in Section 6.

          Broker-Dealer:  Any broker or dealer registered under the Exchange
     Act.

          Closing Date:  The date on which the Series A Notes are originally
     issued under the Indenture.

          Commission:  The Securities and Exchange Commission.
     
          Consummate:  The Exchange Offer shall be deemed "Consummated" for
     purposes of this Agreement upon the occurrence of (i) the filing and
     effectiveness under the Act of the Exchange Offer Registration Statement
     relating to the Series B Notes to be issued in the Exchange Offer, (ii) the
     maintenance of such Registration Statement continuously effective and the
     keeping of the Exchange Offer open for a period not less than the minimum
     period required pursuant to Section 3(b) hereof, and (iii) the delivery by
     the Company to the Registrar under the Indenture of Series B Notes in the
     same aggregate principal amount as the aggregate principal amount of Series
     A Notes that were tendered by Holders thereof pursuant to the Exchange
     Offer.

          Damages Payment Date:  With respect to the Series A Notes, each
     Interest Payment Date.
<PAGE>
 
          Effectiveness Target Date:  As defined in Section 5.

          Exchange Act:  The Securities Exchange Act of 1934, as amended.

          Exchange Offer:  The registration by the Company under the Act of the
     Series B Notes pursuant to a Registration Statement pursuant to which the
     Company offers the Holders of all outstanding Transfer Restricted
     Securities the opportunity to exchange all such outstanding Transfer
     Restricted Securities held by such Holders for Series B Notes in an
     aggregate principal amount equal to the aggregate principal amount of the
     Transfer Restricted Securities tendered in such exchange offer by such
     Holders.

          Exchange Offer Registration Statement:  The Registration Statement
     relating to the Exchange Offer, including the related Prospectus.

          Exempt Resales:  The transactions in which the Initial Purchaser
     proposes to sell the Series A Notes (i) to certain "qualified institutional
     buyers," as such term is defined in Rule 144A under the Act, (ii) to
     certain institutional "accredited investors," as such term is defined in
     Rule 501(a)(1), (2), (3) and (7) of Regulation D under the Act ("Accredited
     Institutions") and (iii) outside the United States to certain non-U.S.
     Persons meeting the requirements of Rule 904 under the Act.

          Holders:  As defined in Section 2(b) hereof.

          Indemnified Holder:  As defined in Section 8(a) hereof.

          Indenture:  The Indenture, dated as of even date herewith,  among the
     Company, State Street Bank and Trust Company, as trustee (the "Trustee"),
     and the Guarantors, pursuant to which the Notes are to be issued, as such
     Indenture is amended or supplemented from time to time in accordance with
     the terms thereof.

          Initial Purchaser:  As defined in the preamble hereto.

          Interest Payment Date:  As defined in the Indenture and the Notes.

          NASD:  National Association of Securities Dealers, Inc.

          Notes: The Series A Notes and the Series B Notes.

          Person:  An individual, partnership, corporation, trust, limited
     liability company or unincorporated organization, or a government or agency
     or political subdivision thereof.

          Prospectus:  The prospectus included in a Registration Statement, as
     amended or supplemented by any prospectus supplement and by all other
     amendments thereto, including post-effective amendments, and all material
     incorporated by reference into such Prospectus.

                                      -2-
<PAGE>
 
     Record Holder:  With respect to any Damages Payment Date relating to Notes,
     each Person who is a Holder of Notes on the record date with respect to the
     Interest Payment Date on which such Damages Payment Date shall occur.

          Registration Default:  As defined in Section 5 hereof.

          Registration Statement:  Any registration statement of the Company
     relating to (a) an offering of Series B Notes and the Subsidiary Guarantees
     pursuant to an Exchange Offer or (b) the registration for resale of
     Transfer Restricted Securities pursuant to the Shelf Registration
     Statement, which is filed pursuant to the provisions of this Agreement, in
     each case, including the Prospectus included therein, all amendments and
     supplements thereto (including post-effective amendments) and all exhibits
     and material incorporated by reference therein.

            Series B Notes: The Company's 7-7/8% Series B Senior Notes due 2008
     to be issued pursuant to the Indenture and the Exchange Offer.

          Shelf Filing Deadline:  As defined in Section 4 hereof.

          Shelf Registration Statement:  As defined in Section 4 hereof.

          Subsidiary Guarantees:  The joint and several guarantees of the
     Company's payment obligations under the Notes by the Guarantors.

          TIA:  The Trust Indenture Act of 1939 (15 U.S.C. Section 77aaa-77bbbb)
     as in effect on the date of the Indenture.

          Transfer Restricted Securities:  Each Series A Note until (i) the date
     on which such Series A Note has been exchanged by a Person other than a
     Broker-Dealer for a Series B Note in the Exchange Offer, (ii) following the
     exchange by a Broker-Dealer in the Exchange Offer of a Series A Note for a
     Series B Note, the date on which such Series B Note is sold to a purchaser
     who receives from such Broker-Dealer on or prior to the date of such sale a
     copy of the Prospectus contained in the Exchange Offer Registration
     Statement, (iii) the date on which such Series A Note has been effectively
     registered under the Act and disposed of in accordance with the Shelf
     Registration Statement or (iv) the date on which such Series A Note is
     distributed to the public pursuant to Rule 144 under the Act or may be
     distributed to the public pursuant to Rule 144(k) under the Act.

          Underwritten Registration or Underwritten Offering:  A registration in
     which securities of the Company are sold to an underwriter for reoffering
     to the public.

                                      -3-
<PAGE>
 
SECTION 2.     SECURITIES SUBJECT TO THIS AGREEMENT

     (a) Transfer Restricted Securities.  The securities entitled to the
benefits of this Agreement are the Transfer Restricted Securities.


     (b) Holders of Transfer Restricted Securities.  A Person is deemed to be a
holder of Transfer Restricted Securities (each, a "Holder") whenever such Person
owns Transfer Restricted Securities of record.

SECTION 3.     REGISTERED EXCHANGE OFFER

     (a) Unless the Exchange Offer shall not be permissible under applicable law
or Commission policy (after the procedures set forth in Section 6(a) below have
been complied with), the Company and the Guarantors shall (i) cause to be filed
with the Commission on or before the 60th day after the Closing Date, a
Registration Statement under the Act relating to the Series B Notes, the
Subsidiary Guarantees and the Exchange Offer, (ii) use their reasonable best
efforts to cause such Registration Statement to become effective on or before
the 120th day after the Closing Date, (iii) in connection with the foregoing,
file (A) all pre-effective amendments to such Registration Statement as may be
necessary in order to cause such Registration Statement to become effective, (B)
if applicable, a post-effective amendment to such Registration Statement
pursuant to Rule 430A under the Act and (C) cause all necessary filings in
connection with the registration and qualification of the Series B Notes and the
Subsidiary Guarantees to be made under the Blue Sky laws of such jurisdictions
as are necessary to permit the Exchange Offer to be Consummated, and (iv) upon
the effectiveness of such Registration Statement, commence the Exchange Offer.
The Exchange Offer Registration Statement shall be on the appropriate form under
the Act permitting registration of the Series B Notes to be offered in exchange
for the Transfer Restricted Securities and to permit resales of the Series B
Notes held by Broker-Dealers as contemplated by Section 3(c) below.

     (b) The Company and the Guarantors shall cause the Exchange Offer
Registration Statement to be effective continuously and shall keep the Exchange
Offer open for a period of not less than the minimum period required under
applicable federal and state securities laws to Consummate the Exchange Offer;
provided, however, that in no event shall such period be less than 20 business
days.  The Company and the Guarantors shall cause the Exchange Offer to comply
with all applicable federal and state securities laws.  No securities other than
the Series B Notes and the Subsidiary Guarantees shall be included in the
Exchange Offer Registration Statement.  The Company and the Guarantors shall use
their reasonable best efforts to cause the Exchange Offer to be Consummated on
the earliest practicable date after the Exchange Offer Registration Statement
has become effective, but in any event on or prior to the 180th day after the
Closing Date.

     (c) The Company and the Guarantors shall indicate in a "Plan of
Distribution" section contained in the Exchange Offer Registration Statement
that any Broker-Dealer 

                                      -4-
<PAGE>
 
who holds Notes that are Transfer Restricted Securities and that were acquired
for its own account as a result of market-making activities or other trading
activities (other than Transfer Restricted Securities acquired directly from the
Company) may exchange such Series A Notes pursuant to the Exchange Offer;
however, such Broker-Dealer may be deemed to be an "underwriter" within the
meaning of the Act and must, therefore, deliver a prospectus meeting the
requirements of the Act in connection with any resales of the Series B Notes
received by such Broker-Dealer in the Exchange Offer, which prospectus delivery
requirement may be satisfied by the delivery by such Broker-Dealer of the
Prospectus contained in the Exchange Offer Registration Statement. Such "Plan of
Distribution" section shall also contain all other information with respect to
such resales by Broker-Dealers that the Commission may require in order to
permit such resales pursuant thereto, but such "Plan of Distribution" shall not
name any such Broker-Dealer or disclose the amount of Notes held by any such
Broker-Dealer except to the extent required by the Commission as a result of a
change in policy after the date of this Agreement.

          The Company and the Guarantors shall use their reasonable best efforts
to keep the Exchange Offer Registration Statement continuously effective,
supplemented and amended as required by the provisions of Section 6(c) below to
the extent necessary to ensure that it is available for resales of Notes
acquired by Broker-Dealers for their own accounts as a result of market-making
activities or other trading activities, and to ensure that it conforms with the
requirements of this Agreement, the Act and the policies, rules and regulations
of the Commission as announced from time to time, for a period of one year from
the date on which the Exchange Offer Registration Statement is declared
effective.

          The Company and the Guarantors shall provide sufficient copies of the
latest version of such Prospectus to Broker-Dealers promptly upon request at any
time during such one-year period in order to facilitate such resales.

SECTION 4.     SHELF REGISTRATION

     (a) Shelf Registration.  If (i) the Company and the Guarantors are not
required to file an Exchange Offer Registration Statement or permitted to
Consummate the Exchange Offer because the Exchange Offer is not permitted by
applicable law or Commission policy (after the procedures set forth in Section
6(a) below have been complied with) or (ii) any Holder of Transfer Restricted
Securities notifies the Company prior to the 20th day following the Consummation
of the Exchange Offer (A) that such Holder is prohibited by applicable law or
Commission policy from participating in the Exchange Offer, or (B) that such
Holder may not resell the Series B Notes acquired by it in the Exchange Offer to
the public without delivering a prospectus and that the Prospectus contained in
the Exchange Offer Registration Statement is not available for such resales by
such Holder, then the Company and the Guarantors shall use their reasonable best
efforts to:

          (x) cause to be filed a shelf registration statement pursuant to Rule
     415 under the Act, which may be an amendment to the Exchange Offer
     Registration 

                                      -5-
<PAGE>
 
     Statement (in either event, the "Shelf Registration Statement") on or prior
     to the earliest to occur of (1) the 60th day after the date on which the
     Company determines that it is not required to file the Exchange Offer
     Registration Statement and (2) the 60th day after the date on which the
     Company receives notice from a Holder of Transfer Restricted Securities as
     contemplated by clause (ii) above (such earliest date being the "Shelf
     Filing Deadline"), which Shelf Registration Statement shall provide for
     resales of all Transfer Restricted Securities the Holders of which shall
     have provided the information required pursuant to Section 4(b) hereof; and

          (y) cause such Shelf Registration Statement to be declared effective
     by the Commission on or before the 120th day after the Shelf Filing
     Deadline.

The Company and the Guarantors shall use their reasonable best efforts to keep
such Shelf Registration Statement continuously effective, supplemented and
amended as required by the provisions of Sections 6(b) and (c) hereof to the
extent necessary to ensure that it is available for resales of Notes by the
Holders of Transfer Restricted Securities entitled to the benefit of this
Section 4(a), and to ensure that it conforms with the requirements of this
Agreement, the Act and the policies, rules and regulations of the Commission as
announced from time to time, for a period of at least two years following the
Closing Date or, if earlier, until the Shelf Registration Statement terminates
when all Transfer Restricted Securities covered by such Shelf Registration
Statement have been sold.

     (b) Provision by Holders of Certain Information in Connection with the
Shelf Registration Statement.  No Holder of Transfer Restricted Securities may
include any of its Transfer Restricted Securities in any Shelf Registration
Statement pursuant to this Agreement unless and until such Holder furnishes to
the Company in writing, within 20 business days after receipt of a request
therefor, such information as the Company may reasonably request for use in
connection with any Shelf Registration Statement or Prospectus or preliminary
Prospectus included therein.  No Holder of Transfer Restricted Securities shall
be entitled to Liquidated Damages pursuant to Section 5 hereof unless and until
such Holder shall have used its best efforts to provide all such reasonably
requested information.  Each Holder as to which any Shelf Registration Statement
is being effected agrees to furnish promptly to the Company all information
required to be disclosed in order to make the information previously furnished
to the Company by such Holder not materially misleading.

                                      -6-
<PAGE>
 
SECTION 5.     LIQUIDATED DAMAGES

     If (i) any of the Registration Statements required by this Agreement to be
filed is not filed with the Commission on or prior to the date specified for
such filing in this Agreement, (ii) any of such Registration Statements has not
been declared effective by the Commission on or prior to the date specified for
such effectiveness in this Agreement (the "Effectiveness Target Date"), whether
or not the Company and the Guarantors have breached any obligations to use their
reasonable best efforts, to cause any such Registration Statement to be declared
effective, (iii) the Exchange Offer has not been Consummated within 180 days of
the Closing Date with respect to the Exchange Offer Registration Statement or
(iv) any Registration Statement required by this Agreement is filed and declared
effective but shall thereafter cease to be effective or fail to be usable for
its intended purpose without being succeeded immediately by a post-effective
amendment to such Registration Statement that cures such failure and that is
itself declared effective on or prior to the Effectiveness Target Date (each
such event referred to in clauses (i) through (iv), a "Registration Default"),
the Company and the Guarantors hereby jointly and severally agree to pay
liquidated damages to each Holder of Transfer Restricted Securities with respect
to the first 90-day period immediately following the occurrence of such
Registration Default in an amount equal to $.05 per week per $1,000 principal
amount of Transfer Restricted Securities held by such Holder for each week or
portion thereof that the Registration Default continues. The amount of the
liquidated damages shall increase by an additional $.05 per week per $1,000 in
principal amount of Transfer Restricted Securities with respect to each
subsequent 90-day period until all Registration Defaults have been cured, up to
a maximum amount of liquidated damages of $.20 per week per $1,000 principal
amount of Transfer Restricted Securities. All accrued liquidated damages shall
be paid to Record Holders by the Company on each Damages Payment Date following
the accrual thereof, in the same manner as provided in the Indenture and the
Notes for the payment of interest on the Notes. Following the cure of all
Registration Defaults relating to any particular Transfer Restricted Securities,
the accrual of liquidated damages with respect to such Transfer Restricted
Securities will cease.

     All obligations of the Company and the Guarantors set forth in the
preceding paragraph that are outstanding with respect to any Transfer Restricted
Security at the time such security ceases to be a Transfer Restricted Security
shall survive until such time as all such obligations with respect to such
security shall have been satisfied in full.

SECTION 6.     REGISTRATION PROCEDURES

     (a) Exchange Offer Registration Statement.  In connection with the Exchange
Offer, the Company and the Guarantors shall comply with all of the provisions of
Section 6(c) below, shall use their reasonable best efforts to effect such
exchange to permit the sale of Transfer Restricted Securities being sold in
accordance with the intended method or methods of distribution thereof, and
shall comply with all of the following provisions:

          (i) If in the reasonable opinion of counsel to the Company there is a

                                      -7-
<PAGE>
 
     question as to whether the Exchange Offer is permitted by applicable law,
     the Company and the Guarantors hereby agree to seek a no-action letter or
     other favorable decision from the Commission allowing the Company and the
     Guarantors to Consummate the Exchange Offer.  The Company and the
     Guarantors hereby agree to pursue the issuance of such a decision to the
     Commission staff level but shall not be required to take commercially
     unreasonable action to effect a change of Commission policy.  The Company
     and the Guarantors hereby agree, however, to (A) participate in telephonic
     conferences with the Commission staff, (B) deliver to the Commission staff
     an analysis prepared by counsel to the Company setting forth the legal
     bases, if any, upon which such counsel has concluded that the Exchange
     Offer should be permitted and (C) diligently pursue a resolution (which
     need not be favorable) by the Commission staff of such submission.

          (ii) The Initial Purchaser, for itself and on behalf of the Holders,
     hereby acknowledges and agrees, and each Holder by its purchase of Transfer
     Restricted Securities shall be deemed to have acknowledged and agreed, that
     any Broker-Dealer and any such Holder using the Exchange Offer to
     participate in a distribution of the securities to be acquired in the
     Exchange Offer (1) could not under Commission policy as in effect on the
     date of this Agreement rely on the position of the Commission enunciated in
     Morgan Stanley and Co., Inc. (available June 5, 1991) and Exxon Capital
     Holdings Corporation (available May 13, 1988), as interpreted in the
     Commission's letter to Shearman & Sterling dated July 2, 1993, and similar
     no-action letters (including any no-action letter obtained pursuant to
     clause (i) above), and (2) must comply with the registration and prospectus
     delivery requirements of the Act in connection with a secondary resale
     transaction and that such a secondary resale transaction should be covered
     by an effective registration statement containing the selling security
     holder information required by Item 507 or 508, as applicable, of
     Regulation S-K if the resales are of Series B Notes obtained by such Holder
     in exchange for Series A Notes acquired by such Holder directly from the
     Company.

          (iii)  Prior to effectiveness of the Exchange Offer Registration
     Statement, the Company and the Guarantors shall provide a supplemental
     letter to the Commission (A) stating that the Company and the Guarantors
     are registering the Exchange Offer in reliance on the position of the
     Commission enunciated in Exxon Capital Holdings Corporation (available May
     13, 1988), Morgan Stanley and Co., Inc. (available June 5, 1991) and, if
     applicable, any no-action letter obtained pursuant to clause (i) above and
     (B) including a representation that neither the Company nor any Guarantor
     has entered into any arrangement or understanding with any Person to
     distribute the Series B Notes to be received in the Exchange Offer and
     that, to the best of the Company's information and belief, each Holder
     participating in the Exchange Offer is acquiring the Series B Notes in its
     ordinary course of business and has no arrangement or understanding with
     any Person to participate in the distribution of the Series B Notes
     received in the Exchange Offer.

     (b) Shelf Registration Statement.  In connection with the Shelf
Registration 

                                      -8-
<PAGE>
 
Statement, if required, the Company and the Guarantors shall comply with all the
provisions of Section 6(c) below and shall use their reasonable best efforts to
effect such registration to permit the sale of the Transfer Restricted
Securities being sold in accordance with the intended method or methods of
distribution thereof and, pursuant thereto, the Company and the Guarantors will
prepare and file with the Commission in accordance with Section 4(a) hereof a
Shelf Registration Statement relating to the registration on any appropriate
form under the Act, which form shall be available for the sale of the Transfer
Restricted Securities in accordance with the intended method or methods of
distribution thereof.

     (c) General Provisions.  In connection with any Registration Statement and
any Prospectus required by this Agreement to permit the sale or resale of
Transfer Restricted Securities (including, without limitation, any Registration
Statement and the related Prospectus required to permit resales of Notes by
Broker-Dealers), the Company and the Guarantors shall:

          (i)    use their reasonable best efforts to keep such Registration
     Statement continuously effective and provide all requisite financial
     statements (including, if required by the Act or any regulation thereunder,
     financial statements of the Guarantors) for the period specified in Section
     3(b) or 4 of this Agreement, as applicable; upon the occurrence of any
     event that would cause any such Registration Statement or the Prospectus
     contained therein (A) to contain a material misstatement or omission or (B)
     not to be effective and usable for the resale of Transfer Restricted
     Securities during the period required by this Agreement, the Company and
     the Guarantors shall file promptly an appropriate amendment to such
     Registration Statement, in the case of clause (A), correcting any such
     misstatement or omission, and, in the case of either clause (A) or (B), use
     their reasonable best efforts to cause such amendment to be declared
     effective and such Registration Statement and the related Prospectus to
     become usable for their intended purpose(s) as soon as practicable
     thereafter;

          (ii)   prepare and file with the Commission such amendments and post-
     effective amendments to the Registration Statement as may be necessary to
     keep the Registration Statement effective for the applicable period set
     forth in Section 3(b) or 4 hereof, as applicable, or such shorter period as
     will terminate when all Transfer Restricted Securities covered by such
     Registration Statement have been sold; cause the Prospectus to be
     supplemented by any required Prospectus supplement, and as so supplemented
     to be filed pursuant to Rule 424 under the Act, and to comply fully with
     the applicable provisions of Rules 424 and 430A under the Act in a timely
     manner; and comply with the provisions of the Act with respect to the
     disposition of all securities covered by such Registration Statement during
     the applicable period in accordance with the intended method or methods of
     distribution by the sellers thereof set forth in such Registration
     Statement or supplement to the Prospectus;

          (iii)  advise the underwriter(s), if any, and selling Holders promptly
     and, if requested by any such Person, to confirm such advice in writing,
     (A) when the 

                                      -9-
<PAGE>
 
     Prospectus or any Prospectus supplement or post-effective amendment has
     been filed, and, with respect to any Registration Statement or any post-
     effective amendment thereto, when the same has become effective, (B) of any
     request by the Commission for amendments to the Registration Statement or
     amendments or supplements to the Prospectus or for additional information
     relating thereto, (C) of the issuance by the Commission of any stop order
     suspending the effectiveness of the Registration Statement under the Act or
     of the suspension by any state securities commission of the qualification
     of the Transfer Restricted Securities for offering or sale in any
     jurisdiction, or the initiation of any proceeding for any of the preceding
     purposes, (D) of the existence of any fact or the happening of any event
     that makes any statement of a material fact made in the Registration
     Statement, the Prospectus, any amendment or supplement thereto, or any
     document incorporated by reference therein untrue, or that requires the
     making of any additions to or changes in the Registration Statement or the
     Prospectus in order to make the statements therein not misleading. If at
     any time the Commission shall issue any stop order suspending the
     effectiveness of the Registration Statement, or any state securities
     commission or other regulatory authority shall issue an order suspending
     the qualification or exemption from qualification of the Transfer
     Restricted Securities under state securities or Blue Sky laws, the Company
     and the Guarantors shall use their reasonable best efforts to obtain the
     withdrawal or lifting of such order at the earliest possible time;

          (iv)   furnish to each of the selling Holders and each of the
     underwriter(s), if any, before filing with the Commission, copies of any
     Registration Statement or any Prospectus included therein or any amendments
     or supplements to any such Registration Statement or Prospectus (but
     excluding any documents incorporated by reference as a result of the
     Company's periodic reporting requirements under the Exchange Act), and
     neither the Company nor any Guarantors shall file any such Registration
     Statement or Prospectus or any amendment or supplement to any such
     Registration Statement or Prospectus (excluding all such documents
     incorporated by reference as a result of the Company's periodic reporting
     requirements under the Exchange Act) to which a selling Holder of Transfer
     Restricted Securities covered by such Registration Statement or the
     underwriter(s), if any, shall reasonably object within five business days
     after the receipt thereof.  A selling Holder or underwriter, if any, shall
     be deemed to have reasonably objected to such filing if such Registration
     Statement, amendment, Prospectus or supplement, as applicable, as proposed
     to be filed, contains a material misstatement or omission;

          (v)    promptly following the filing of any document that is to be
     incorporated by reference into a Registration Statement or Prospectus,
     provide copies of such document to the selling Holders and to the
     underwriter(s), if any, make the Company's representatives available for
     discussion of such document and other customary due diligence matters, and
     include such information in such document prior to the filing thereof as
     such selling Holders or underwriter(s), if any, reasonably may request;

                                      -10-
<PAGE>
 
          (vi)   make available at reasonable times for inspection by the
     selling Holders, any underwriter participating in any disposition pursuant
     to such Registration Statement, and any attorney or accountant retained by
     such selling Holders or any of the underwriter(s), all relevant financial
     and other records, pertinent corporate documents and properties of the
     Company and the Guarantors and cause the Company's and the Guarantors'
     officers, directors and employees to supply all information reasonably
     requested by any such Holder, underwriter, attorney or accountant in
     connection with such Registration Statement subsequent to the filing
     thereof and prior to its effectiveness; provided, however, that the
     foregoing inspection and information gathering (i) shall be coordinated on
     behalf of the Selling Holders, underwriters, or any representative thereof,
     by one counsel, who shall be Vinson & Elkins L.L.P. or such other counsel
     as may be chosen by the Holders of a majority in principal amount of
     Transfer Restricted Securities, and (ii) shall not be available for any
     such Holder who does not agree in writing to hold such information in
     confidence.

          (vii)  if requested by any selling Holders or the underwriter(s), if
     any, promptly incorporate in any Registration Statement or Prospectus,
     pursuant to a supplement or post-effective amendment if necessary, such
     information as such selling Holders and underwriter(s), if any, may
     reasonably request to have included therein, including, without limitation,
     information relating to the "Plan of Distribution" of the Transfer
     Restricted Securities, information with respect to the principal amount of
     Transfer Restricted Securities being sold to such underwriter(s), the
     purchase price being paid therefor and any other terms of the offering of
     the Transfer Restricted Securities to be sold in such offering; and
     make all required filings of such Prospectus supplement or post-effective
     amendment as soon as practicable after the Company is notified of the
     matters to be incorporated in such Prospectus supplement or post-effective
     amendment;

          (viii) furnish to each selling Holder and each of the underwriter(s),
     if any, without charge, at least one copy of the Registration Statement, as
     first filed with the Commission, and of each amendment thereto, including
     all documents incorporated by reference therein and all exhibits (including
     exhibits incorporated therein by reference);

          (ix)   deliver to each selling Holder and each of the underwriter(s),
     if any, without charge, as many copies of the Prospectus (including each
     preliminary prospectus) and any amendment or supplement thereto as such
     Persons reasonably may request; the Company and the Guarantors hereby
     consent to the use of the Prospectus and any amendment or supplement
     thereto by each of the selling Holders and each of the underwriter(s), if
     any, in connection with the offering and the sale of the Transfer
     Restricted Securities covered by the Prospectus or any amendment or
     supplement thereto; provided that such use of the Prospectus and any
     amendment or supplement thereto and such offering and sale conforms to the
     Plan of Distribution set forth in the Prospectus and complies with the
     terms of this Agreement and all applicable laws and regulations thereunder;

                                      -11-
<PAGE>
 
          (x)    in the event of an Underwritten Registration, enter into such
     customary agreements (including an underwriting agreement), make such
     customary representations and warranties, deliver such customary documents
     and certificates, and take all such other customary actions in connection
     therewith in order to expedite or facilitate the disposition of the
     Transfer Restricted Securities pursuant to any Shelf Registration Statement
     contemplated by this Agreement, all to such extent as may be requested by
     any Holder of Transfer Restricted Securities or underwriter in connection
     with any sale or resale pursuant to any Shelf Registration Statement
     contemplated by this Agreement; and, without limiting the generality of the
     foregoing, the Company and the Guarantors shall:

               (A) furnish to each underwriter upon the effectiveness of the
          Shelf Registration Statement:

                    (1) a certificate, dated the date of effectiveness of the
               Shelf Registration Statement,  signed on behalf of the Company by
               two senior officers, one of whom must be its Chief Financial
               Officer, confirming, as of such date, the matters set forth in
               paragraphs (a), (c) and (d) of Section 8 of the Purchase
               Agreement with respect to the transactions contemplated by the
               Shelf Registration Statement;

                    (2) an opinion, dated the date of effectiveness of the Shelf
               Registration Statement, of counsel for the Company and the
               Guarantors, covering the matters set forth in Exhibit A of the
               Purchase Agreement with respect to the transactions contemplated
               by the Shelf Registration Statement, and in any event including a
               statement to the effect that such counsel has participated in
               conferences with officers and other representatives of the
               Company and the Guarantors, representatives of the independent
               accountants of the Company and the Guarantors and representatives
               of the Initial Purchaser at which the contents of the
               Registration Statement and related matters were discussed and,
               although it does not assume any responsibility for the accuracy,
               completeness or fairness of the statements contained in the
               Registration Statement during the course of such participation,
               no facts came to its attention that caused such counsel to
               believe that the Registration Statement, at the time such
               Registration Statement or any post-effective amendment thereto
               became effective, contained any untrue statement of a material
               fact or omitted to state any fact required to be stated therein
               or necessary to make the statements therein not misleading, or
               that the Prospectus contained in such Registration Statement as
               of its date contained an untrue statement of a material fact or
               omitted to state a material fact necessary in order to make the
               statements therein, in the light of the circumstances under which
               they were made, not misleading (except as to financial statements
               and related notes, the financial statement schedules and other

                                      -12-
<PAGE>
 
               financial and statistical data included therein); and

                    (3) a customary comfort letter, dated as of the date of
               effectiveness of the Shelf Registration Statement, from the
               Company's independent accountants if such comfort letter shall be
               issuable to the underwriters in accordance with the relevant
               accounting industry pronouncements, in the customary form and
               covering matters of the type customarily covered in comfort
               letters by underwriters in connection with primary underwritten
               offerings, and affirming the matters set forth in the comfort
               letters delivered pursuant to Section 8(g) of the Purchase
               Agreement, without exception; and

               (B) deliver such other documents and certificates as may be
          reasonably requested by such parties to evidence compliance with
          clause (A) above.

     If at any time the representations and warranties of the Company and the
     Guarantors contemplated in clause (A)(1) above cease to be true and
     correct, the Company shall so advise the Initial Purchasers and the
     underwriter(s), if any, and each selling Holder promptly and, if requested
     by any such Person, shall confirm such advice in writing;

          (xi)   prior to any public offering of Transfer Restricted Securities,
     cooperate with the selling Holders, the underwriter(s), if any, and their
     respective counsel in connection with the registration and qualification of
     the Transfer Restricted Securities under the securities or Blue Sky laws of
     such jurisdictions as the selling Holders or underwriter(s) may request and
     do any and all other acts or things reasonably necessary or advisable to
     enable the disposition in such jurisdictions of the Transfer Restricted
     Securities covered by the Shelf Registration Statement; provided, however,
     that neither the Company nor the Guarantors shall be required to register
     or qualify as a foreign corporation where it is not now so qualified or to
     take any action that would subject it to the service of process in suits or
     to taxation, other than as to matters and transactions relating to the
     Registration Statement, in any jurisdiction where it is not now so subject;

          (xii)  issue, upon the request of any Holder of Series A Notes covered
     by the Shelf Registration Statement, Series B Notes, having an aggregate
     principal amount equal to the aggregate principal amount of Series A Notes
     being sold by such Holder; such Series B Notes to be registered in the name
     of the purchaser(s) of such Notes, as the case may be; in return, the
     Series A Notes held by such Holder shall be surrendered to the Company for
     cancellation;

          (xiii) cooperate with the selling Holders and the underwriter(s), if
     any, to facilitate the timely preparation and delivery of certificates
     representing Transfer Restricted Securities to be sold and not bearing any
     restrictive legends; and enable such Transfer Restricted Securities to be
     in such denominations and 

                                      -13-
<PAGE>
 
     registered in such names as the Holders or the underwriter(s), if any, may
     reasonably request at least two business days prior to any sale of Transfer
     Restricted Securities made by such underwriter(s);

          (xiv)   if any fact or event contemplated by clause (c)(iii)(D) above
     shall exist or have occurred, prepare a supplement or post-effective
     amendment to the Registration Statement or related Prospectus or any
     document incorporated therein by reference or file any other required
     document so that, as thereafter delivered to the purchasers of Transfer
     Restricted Securities, the Prospectus will not contain any untrue statement
     of a material fact or omit to state any material fact necessary to make the
     statements therein not misleading;

          (xv)    provide a CUSIP number for all Series B Notes not later than
     the effective date of the Registration Statement and provide the Trustee
     under the Indenture with one or more global certificates for the Series B
     Notes that are in a form eligible for deposit with The Depository Trust
     Company;

          (xvi)   cooperate and assist in any filings required to be made with
     the NASD and in the performance of any due diligence investigation by any
     underwriter (including any "qualified independent underwriter") that is
     required to be retained in accordance with the rules and regulations of the
     NASD;

          (xvii)  otherwise use their reasonable best efforts to comply with all
     applicable rules and regulations of the Commission, and make generally
     available to its security holders, as soon as practicable, a consolidated
     earnings statement meeting the requirements of Rule 158 (which need not be
     audited) for the twelve-month period (A) commencing at the end of any
     fiscal quarter in which Transfer Restricted Securities are sold to
     underwriters in a firm or best efforts Underwritten Offering or (B) if not
     sold to underwriters in such an offering, beginning with the first month of
     the Company's first fiscal quarter commencing after the effective date of
     the Registration Statement;

          (xviii) cause the Indenture to be qualified under the TIA not later
     than the effective date of the first Registration Statement required by
     this Agreement, and, in connection therewith, cooperate with the Trustee
     and the Holders of Notes to effect such changes to the Indenture as may be
     required for such Indenture to be so qualified in accordance with the terms
     of the TIA; and execute and use their reasonable best efforts to cause the
     Trustee to execute, all documents that may be required to effect such
     changes and all other forms and documents required to be filed with the
     Commission to enable such Indenture to be so qualified in a timely manner;
     and

          (xix)   provide promptly to each Holder upon request each document
     filed with the Commission pursuant to the requirements of Section 13 or
     Section 15 of the Exchange Act.

          Each Holder agrees by acquisition of a Transfer Restricted Security
that, 

                                      -14-
<PAGE>
 
upon receipt of any notice from the Company of the existence of any fact of the
kind described in Section 6(c)(iii)(D) hereof, such Holder will keep such notice
confidential and forthwith discontinue disposition of Transfer Restricted
Securities pursuant to the applicable Registration Statement until such Holder's
receipt of the copies of the supplemented or amended Prospectus contemplated by
Section 6(c)(xiv) hereof, or until it is advised in writing (the "Advice") by
the Company that the use of the Prospectus may be resumed, and has received
copies of any additional or supplemental filings that are incorporated by
reference in the Prospectus. If so directed by the Company, each Holder will
deliver to the Company (at the Company's expense) all copies, other than
permanent file copies then in such Holder's possession, of the Prospectus
covering such Transfer Restricted Securities that was current at the time of
receipt of such notice. In the event the Company shall give any such notice, the
time period regarding the effectiveness of such Registration Statement set forth
in Section 3 or 4 hereof, as applicable, shall be extended by the number of days
during the period from and including the date of the giving of such notice
pursuant to Section 6(c)(iii)(D) hereof to and including the date when each
selling Holder covered by such Registration Statement shall have received the
copies of the supplemented or amended Prospectus contemplated by Section
6(c)(xiv) hereof or shall have received the Advice.

SECTION 7.     REGISTRATION EXPENSES

     (a) All expenses incident to the Company's or the Guarantors' performance
of or compliance with this Agreement will be borne by the Company and the
Guarantors, regardless of whether a Registration Statement becomes effective,
including without limitation: (i) all registration and filing fees and expenses
(including filings made by the Initial Purchaser or Holder with the NASD (and,
if applicable, the fees and expenses of any "qualified independent underwriter"
and its counsel that may be required by the rules and regulations of the NASD));
(ii) all fees and expenses of compliance with federal securities and state Blue
Sky or securities laws; (iii) all expenses of printing (including printing of
Prospectuses), messenger and delivery services and telephone; (iv) all fees and
disbursements of counsel for the Company and the Guarantors and, subject to
Section 7(b) below, the Holders of Transfer Restricted Securities; (v) all
application and filing fees in connection with listing Notes on a national
securities exchange or automated quotation system, if any; and (vi) all fees and
disbursements of independent public accountants of the Company and the
Guarantors (including the expenses of any special audit and comfort letters
required by or incident to such performance).

          The Company and the Guarantors will, in any event, bear their internal
expenses (including, without limitation, all salaries and expenses of its
officers and employees performing legal or accounting duties), the expenses of
any annual audit and the fees and expenses of any Person, including special
experts, retained by the Company or any Guarantor.  The Company shall not be
responsible for any other expenses or costs, including but not limited to
commissions, fees and discounts of underwriters, brokers, dealers and agents.

     (b) In connection with any Registration Statement required by this
Agreement (excluding the Exchange Offer Registration Statement), the Company and
the Guarantors 

                                      -15-
<PAGE>
 
will reimburse the Initial Purchaser and the Holders of Transfer Restricted
Securities being tendered in the Exchange Offer and/or resold pursuant to the
"Plan of Distribution" contained in the Exchange Offer Registration Statement or
registered pursuant to the Shelf Registration Statement, as applicable, for the
reasonable fees and disbursements of not more than one counsel, who shall be
Vinson & Elkins L.L.P. or such other counsel as may be chosen by the Holders of
a majority in principal amount of the Transfer Restricted Securities for whose
benefit such Registration Statement is being prepared.

SECTION 8.     INDEMNIFICATION

     (a) The Company and the Guarantors, jointly and severally, agree to
indemnify and hold harmless (i) each Holder, (ii) the Initial Purchaser, (iii)
each person, if any, who controls any Holder or the Initial Purchaser within the
meaning of Section 15 of the Act or Section 20(a) of the Exchange Act and (iii)
the respective officers, directors, partners, employees, representatives and
agents of any Holder or the Initial Purchaser or any controlling person (any
person referred to in clauses (i), (ii) or (iii) may hereinafter be referred to
as an "Indemnified Holder"), to the fullest extent lawful, from and against any
and all losses, liabilities, claims, damages and expenses whatsoever (including
but not limited to reasonable attorneys' fees and any and all reasonable
expenses whatsoever incurred in investigating, preparing or defending against
any investigation or litigation, commenced or threatened, or any claim
whatsoever, and any and all amounts paid in settlement of any claim or
litigation), joint or several, to which they or any of them may become subject
under the Act, the Exchange Act or otherwise, insofar as such losses,
liabilities, claims, damages or expenses (or actions in respect thereof) arise
out of or are based upon any untrue statement or alleged untrue statement of a
material fact contained in any Registration Statement or Prospectus, or in any
supplement thereto or amendment thereof, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading; provided, however,
that the Company and the Guarantors will not be liable in any such case to the
extent, but only to the extent, that any such loss, liability, claim, damage or
expense arises out of or is based upon any such untrue statement or alleged
untrue statement or omission or alleged omission made therein in reliance upon
and in conformity with written information furnished to the Company by or on
behalf of the any of the Holders expressly for use therein. This indemnity
agreement will be in addition to any liability that the Company and the
Guarantors may otherwise have, including under this Agreement.

     (b) Each Holder of Transfer Restricted Securities agrees, severally and not
jointly, to indemnify and hold harmless the Company, each of the Guarantors and
each person, if any, who controls the Company or any Guarantor within the
meaning of Section 15 of the Act or Section 20(a) of the Exchange Act and each
of their respective officers, directors, employers, partners, representatives
and agents to the same extent as the foregoing indemnity from the Company and
the Guarantors to each of the Indemnified Holders, but only with respect to
information relating to such Holder furnished in writing by such Holder for use
in any Registration Statement, or in any amendment thereof or supplement
thereto; provided, however, that in no case shall any selling Holder be liable

                                      -16-
<PAGE>
 
or responsible for any amount in excess of proceeds received by such Holder upon
the sale of the Notes giving rise to such indemnification obligation.  This
indemnity will be in addition to any liability that the Holders may otherwise
have, including under this Agreement.

     (c) Promptly after receipt by an indemnified party under subsection (a) or
(b) above of notice of the commencement of any action, such indemnified party
shall, if a claim in respect thereof is to be made against the indemnifying
party under such subsection, notify each party against whom indemnification is
to be sought in writing of the commencement thereof (but the failure so to
notify an indemnifying party shall not relieve it from any liability that it may
have under this Section 8 or otherwise except to the extent that it has been
prejudiced in any material respect by such failure). In case any such action is
brought against any indemnified party, and it notifies an indemnifying party of
the commencement thereof, the indemnifying party will be entitled to participate
therein, and to the extent it may elect by written notice delivered to the
indemnified party promptly after receiving the aforesaid notice from such
indemnified party, to assume and control the defense thereof with counsel
reasonably satisfactory to such indemnified party. Notwithstanding the
foregoing, the indemnified party or parties shall have the right to employ its
or their own counsel in any such case, but the fees and expenses of such counsel
shall be at the expense of such indemnified party or parties unless (i) the
employment of such counsel shall have been authorized in writing by the
indemnifying parties in connection with the defense of such action, (ii) the
indemnifying parties shall not have employed counsel to take charge of the
defense of such action within a reasonable time after notice of commencement of
the action, or (iii) such indemnified party or parties shall have reasonably
concluded that there may be defenses available to it that are different from or
additional to those available to one or all of the indemnifying parties (in
which case the indemnifying party shall not have the right to direct the defense
of such action on behalf of the indemnified party or parties), in any of which
events such fees and expenses of counsel shall be borne by the indemnifying
parties; provided, however, that the indemnifying party under subsection (a) or
(b) above shall only be liable for the legal expenses of one counsel (in
addition to any local counsel) for all indemnified parties. Anything in this
subsection to the contrary notwithstanding, an indemnifying party shall not be
liable for any settlement of any claim or action effected without its prior
written consent; provided that such consent was not unreasonably withheld.

                                      -17-
<PAGE>
 
SECTION 9.     CONTRIBUTION

                                      -18-
<PAGE>
 
     In order to provide for contribution in circumstances in which the
indemnification provided for in Section 8 is for any reason held to be
unavailable or is insufficient to hold harmless a party indemnified thereunder,
the Company and the Guarantors, on the one hand, and the Holders on the other
hand, shall contribute to the aggregate losses, claims, damages, liabilities and
expenses of the nature contemplated by such indemnification provision (including
any investigation, legal and other expenses incurred in connection with, and any
amount paid in settlement of, any action, suit or proceeding or any claims
asserted, but after deducting in the case of losses, claims, damages,
liabilities and expenses suffered by the Company and the Guarantors, any
contribution received by the Company and the Guarantors from Persons, other than
a Holder, who may also be liable for contribution, including persons who control
the Company and the Guarantors within the meaning of Section 15 of the Act or
Section 20(a) of the Exchange Act) to which the Company, the Guarantors or any
Holder may be subject, (i) in such proportion as is appropriate to reflect the
relative fault of the Company and the Guarantors, on one hand, and each Holder,
on the other hand, in connection with the statements or omissions that resulted
in such losses, claims, damages, liabilities or expenses, or (ii) if the
allocation provided by clause (i) is not permitted by applicable law, in such
proportion as is appropriate to reflect not only the relative fault referred to
in clause (i) above but also other relevant equitable considerations. The
relative fault of the Company and the Guarantors, on one hand, and of each
Holder, on the other hand, shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by the Company, the Guarantors or such Holder and the parties' relative
intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission. The Company, the Guarantors and each Holder of
Transfer Restricted Securities agree that it would not be just and equitable if
contribution pursuant to this Section 9 were determined by pro rata allocation
or by any other method of allocation that does not take into account the
equitable considerations referred to above. Notwithstanding the provisions of
this Section 9, (i) in no case shall any Holder be required to contribute any
amount in excess of the amount by which the proceeds received by such Holder
upon the sale of the Transfer Restricted Securities giving rise to such
obligation exceeds the amount of any damages that such Holder has otherwise been
required to pay by reason of any untrue or alleged untrue statement or omission
or alleged omission and (ii) no person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Act) shall be entitled to
contribution from any Person who was not guilty of such fraudulent
misrepresentation. For purposes of this Section 9, (A) each Person, if any, who
controls any of the Holders within the meaning of Section 15 of the Act or
Section 20(a) of the Exchange Act and (B) the respective officers, directors,
partners, employees, representatives and agents of such Holder or any
controlling Person shall have the same rights to contribution as the Holders,
and each Person, if any, who controls the Company or any Guarantor within the
meaning of Section 15 of the Act or Section 20(a) of the Exchange Act shall have
the same rights to contribution as the Company and the Guarantors, subject in
each case to clauses (i) and (ii) of this Section 9. Any party entitled to
contribution will, promptly after receipt of notice of commencement of any
action, suit or proceeding against such party in respect of which a claim for
contribution may be made against another party or parties under this Section 9,
notify such party or parties from whom contribution may be sought, but the
failure to so notify

                                      -19-
<PAGE>
 
such party or parties shall not relieve the party or parties from whom
contribution may be sought from any obligation it or they may have under this
Section 9 or otherwise. No party shall be liable for contribution with respect
to any action or claim settled without its prior written consent; provided that
such written consent was not unreasonably withheld.

SECTION 10.    RULE 144A

     The Company and the Guarantors hereby agree with each Holder, for so long
as any Transfer Restricted Securities remain outstanding, to make available to
any Holder or beneficial owner of Transfer Restricted Securities in connection
with any sale thereof and any prospective purchaser of such Transfer Restricted
Securities from such Holder or beneficial owner, the information required by
Rule 144A(d)(4) under the Act in order to permit resales of such Transfer
Restricted Securities pursuant to Rule 144A.

SECTION 11.    PARTICIPATION IN UNDERWRITTEN REGISTRATIONS

     No Holder may participate in any Underwritten Registration hereunder unless
such Holder (a) agrees to sell such Holder's Transfer Restricted Securities on
the basis provided in any underwriting arrangements approved by the Persons
entitled hereunder to approve such arrangements and (b) completes and executes
all reasonable questionnaires, powers of attorney, indemnities, underwriting
agreements, lock-up letters and other documents required under the terms of such
underwriting arrangements.

SECTION 12.    SELECTION OF UNDERWRITERS

     The Holders of Transfer Restricted Securities covered by the Shelf
Registration Statement who desire to do so may sell such Transfer Restricted
Securities in an Underwritten Offering.  In any such Underwritten Offering, the
investment banker or investment bankers and manager or managers that will
administer the offering will be selected by the Holders of a majority in
aggregate principal amount of the Transfer Restricted Securities included in
such offering; provided, however, that such investment bankers and managers must
be reasonably satisfactory to the Company.

SECTION 13.    MISCELLANEOUS

     (a) [Intentionally omitted.]

     (b) No Inconsistent Agreements. The Company and the Guarantors shall not,
on or after the date of this Agreement, enter into any agreement with respect to
its securities that is inconsistent with the rights granted to the Holders in
this Agreement or otherwise conflicts with the provisions hereof. The rights
granted to the Holders hereunder do not in any way conflict with and are not
inconsistent with the rights granted to the holders of the Company's or any
Guarantor's securities under any agreement in effect on the date hereof.

     (c) Adjustments Affecting the Notes.  The Company and the Guarantors shall
not take any action with respect to the Notes that would materially and
adversely affect 

                                      -20-
<PAGE>
 
the ability of the Holders to Consummate the Exchange Offer.

     (d) Amendments and Waivers.  The provisions of this Agreement may not be
amended, modified or supplemented, and waivers or consents to or departures from
the provisions hereof may not be given unless the Company has obtained the
written consent of Holders of a majority of the outstanding principal amount of
Transfer Restricted Securities.  Notwithstanding the foregoing, a waiver or
consent to departure from the provisions hereof that relates exclusively to the
rights of Holders whose securities are being tendered pursuant to the Exchange
Offer and that does not affect directly or indirectly the rights of other
Holders whose securities are not being tendered pursuant to such Exchange Offer
may be given by the Holders of a majority of the outstanding principal amount of
Transfer Restricted Securities being tendered.

     (e) Notices.  All notices and other communications provided for or
permitted hereunder shall be made in writing by hand-delivery, first-class mail
(registered or certified, return receipt requested), telecopier, or air courier
guaranteeing overnight delivery:

          (i)  if to a Holder, at the address set forth on the records of the
     Registrar under the Indenture, with a copy to the Registrar under the
     Indenture; and

          (ii) if to the Company or any Guarantor:

                    Offshore Logistics, Inc.
                    P.O. Box 5-C
                    224 Rue de Jean
                    Lafayette, Louisiana 70505

                    Telecopier No.: (318) 235-6678
                    Attention:  Corporate Secretary

               with a copy to:

                    Fulbright & Jaworski L.L.P.
                    1301 McKinney, Suite 5100
                    Houston, Texas 77010
 
                    Telecopier No.:  (713) 651-5246
                    Attention:  Arthur H. Rogers

     All such notices and communications shall be deemed to have been duly
given: at the time delivered by hand, if personally delivered; five business
days after being deposited in the mail, postage prepaid, if mailed; when receipt
acknowledged, if telecopied; and on the next business day, if timely delivered
to an air courier guaranteeing overnight delivery.

     Copies of all such notices, demands or other communications shall be

                                      -21-
<PAGE>
 
concurrently delivered by the Person giving the same to the Trustee at the
address specified in the Indenture.

     (f) Successors and Assigns.  This Agreement shall inure to the benefit of
and be binding upon the successors and assigns of each of the parties, including
without limitation and without the need for an express assignment, the
successors and assigns of subsequent Holders of Transfer Restricted Securities;
provided, however, that this Agreement shall not inure to the benefit of or be
binding upon a successor or assign of a Holder unless and to the extent such
successor or assign acquired Transfer Restricted Securities from such Holder.

     (g) Counterparts.  This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

     (h) Headings.  The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

     (i) Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

     (j) Severability.  In the event that any one or more of the provisions
contained herein, or the application thereof in any circumstance, is held
invalid, illegal or unenforceable, the validity, legality and enforceability of
any such provision in every other respect and of the remaining provisions
contained herein shall not be affected or impaired thereby.

                          [Signature page to follow]

                                      -22-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first written above.

                              Offshore Logistics, Inc.

                              By: /s/ Drury A. Milke
                                 -------------------------------------
                                 Drury A. Milke
                                 Vice President, Chief Financial Officer and
                                 Treasurer
 

                              Air Logistics of Alaska, Inc.
                              Grasso Corporation
                              Grasso Production Management, Inc.
                              Medic Systems, Inc.
                              Pumpkin Air, Inc.


                              By: /s/ Drury A. Milke
                                 -------------------------------------
                                 Drury A. Milke
                                 Vice President
 

                              Air Logistics, L.L.C.
                              By:   Offshore Logistics, Inc.,
                                    its sole member

 
                              By: /s/ Drury A. Milke
                                 -------------------------------------
                                      Drury A. Milke
                                      Vice President, Chief Financial Officer
                                       and Treasurer


Accepted and agreed to as of
the date first above written:

Jefferies & Company, Inc.


By: /s/ David Frischkorn, Jr. 
   ----------------------------
   Name: David Frischkorn, Jr.
   Title: Managing Director

                                      -23-
