<SEC-DOCUMENT>0000924355-05-000230.txt : 20120705
<SEC-HEADER>0000924355-05-000230.hdr.sgml : 20120704
<ACCEPTANCE-DATETIME>20050127110253
ACCESSION NUMBER:		0000924355-05-000230
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20050127
DATE AS OF CHANGE:		20050127
GROUP MEMBERS:		CTAGGART@SSRM.COM
GROUP MEMBERS:		MLOMASNEY@SSRM.COM

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MESA AIR GROUP INC
		CENTRAL INDEX KEY:			0000810332
		STANDARD INDUSTRIAL CLASSIFICATION:	AIR TRANSPORTATION, SCHEDULED [4512]
		IRS NUMBER:				850302351
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-40348
		FILM NUMBER:		05552318

	BUSINESS ADDRESS:	
		STREET 1:		410 NORTH 44TH STREET
		STREET 2:		SUITE 700
		CITY:			PHOENIX
		STATE:			AZ
		ZIP:			85008
		BUSINESS PHONE:		6026854000

	MAIL ADDRESS:	
		STREET 1:		410 NORTH 44TH STREET
		STREET 2:		SUITE 700
		CITY:			PHOENIX
		STATE:			AZ
		ZIP:			85008

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MESA AIRLINES INC
		DATE OF NAME CHANGE:	19950426

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			STATE STREET RESEARCH & MANAGEMENT CO //MA/
		CENTRAL INDEX KEY:			0000924355
		IRS NUMBER:				133142135
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		ONE FINANCIAL CENTER
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02111
		BUSINESS PHONE:		6173571399

	MAIL ADDRESS:	
		STREET 1:		ONE FINANCIAL CENTER
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02111
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>mesa13g.htm
<DESCRIPTION>MESA 13G FOR YEAR END
<TEXT>
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<TITLE>SECURITIES AND EXCHANGE COMMISSION</TITLE>
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<B><P ALIGN="CENTER">SECURITIES AND EXCHANGE COMMISSION</P>
<P ALIGN="CENTER">WASHINGTON, D.C. 20549</P>
</B><P ALIGN="CENTER"> </P>
<B><P ALIGN="CENTER">SCHEDULE 13G</P>
</B><P ALIGN="CENTER">(Rule 13d-102)</P>
<P ALIGN="CENTER"></P>
<P ALIGN="CENTER">INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT </P>
<P ALIGN="CENTER">TO RULES 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED </P>
<P ALIGN="CENTER">PURSUANT TO RULE 13d-2(b)</P>
<P ALIGN="CENTER">(Amendment No. 4)</P>
<P ALIGN="CENTER"> </P>
<B><P ALIGN="CENTER">Mesa Air Group Inc</P>
</B><P ALIGN="CENTER">____________________________________________</P>
<P ALIGN="CENTER">(Name of Issuer)</P>
<P ALIGN="CENTER"> </P>
<B><P ALIGN="CENTER">Common Stock, no par value</P>
</B><P ALIGN="CENTER">____________________________________________</P>
<P ALIGN="CENTER">(Title of Class of Securities)</P>
<P ALIGN="CENTER"> </P>
<B><P ALIGN="CENTER">590479101</P>
</B><P ALIGN="CENTER">_________________________</P>
<P ALIGN="CENTER">(CUSIP Number)</P>
<B><P ALIGN="CENTER">12/31/04</P>
</B><P ALIGN="CENTER">_________________________</P>
<P ALIGN="CENTER">(Date of Event Which Requires Filing of this Statement)</P>
<P ALIGN="CENTER"></P>
<P ALIGN="CENTER">&nbsp;</P>
<P>Check the appropriate box to designate the rule pursuant to which this Schedule is filed:</P>

<P><FONT FACE="Wingdings">&#120;</FONT>
&#9;Rule 13d-1(b)</P>

<UL TYPE="CIRCLE">
<LI>Rule 13d-1(c)</LI></UL>

<P><FONT FACE="Wingdings">&#111;</FONT>
&#9;Rule 13d-1(c) </div></P>

<TABLE BORDER CELLSPACING=1 CELLPADDING=7 WIDTH=637>
<TR><TD WIDTH="8%" VALIGN="TOP">
<H4>&nbsp;</H4>
<H4>1.</H4></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4>
<P><B>NAMES OF REPORTING PERSONS</P>
</B><H4>I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)</H4>
<ADDRESS>State Street Research &amp; Management Company</ADDRESS>
<ADDRESS>#13-31424135</ADDRESS></TD>
</TR>
<TR><TD WIDTH="8%" VALIGN="TOP">
<P ALIGN="RIGHT"></P>
<H4>2.</H4></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4>
<H4>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*</H4>
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<P>(b)&#9;<FONT FACE="Wingdings">&#111;</FONT>
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</FONT></TD>
</TR>
<TR><TD WIDTH="8%" VALIGN="TOP" BGCOLOR="#ffffff">
<B><P>3.</B></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4 BGCOLOR="#ffffff">
<H4>SEC USE ONLY</H4></TD>
</TR>
<TR><TD WIDTH="8%" VALIGN="TOP">
<B><DL>
<DT>4.</DT>
</DL></B></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4>
<B><P>CITIZENSHIP OR PLACE OF ORGANIZATION</B><I> </P>
</I><ADDRESS>Delaware corporation</ADDRESS></TD>
</TR>
<TR><TD WIDTH="22%" VALIGN="TOP" COLSPAN=3 ROWSPAN=8 HEIGHT=18>
<B><P ALIGN="CENTER">NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH</B></TD>
<TD WIDTH="8%" VALIGN="TOP" ROWSPAN=2 HEIGHT=18>
<B><P>5. </B></TD>
<TD WIDTH="71%" VALIGN="TOP" ROWSPAN=2 HEIGHT=18>
<B><P>SOLE VOTING POWER</B> </P>
<I><DL>
<DT>2,427,180</DT>
</DL></I></TD>
</TR>
<TR></TR>
<TR><TD WIDTH="8%" VALIGN="TOP" ROWSPAN=2 HEIGHT=31>
<H4>6. </H4></TD>
<TD WIDTH="71%" VALIGN="TOP" ROWSPAN=2 HEIGHT=31>
<H4>SHARED VOTING POWER </H4>
<I><DL>
<DT>0</DT>
</DL></I></TD>
</TR>
<TR></TR>
<TR><TD WIDTH="8%" VALIGN="TOP" ROWSPAN=2 HEIGHT=31>
<H4>7. </H4></TD>
<TD WIDTH="71%" VALIGN="TOP" ROWSPAN=2 HEIGHT=31>
<H4>SOLE DISPOSITIVE POWER </H4>
<I><H4>2,427,180</H4></I></TD>
</TR>
<TR></TR>
<TR><TD WIDTH="8%" VALIGN="TOP" ROWSPAN=2 HEIGHT=31>
<B><P>8.</B> </TD>
<TD WIDTH="71%" VALIGN="TOP" ROWSPAN=2 HEIGHT=31>
<B><P>SHARED DISPOSITIVE POWER</B> </P>
<I><DL>
<DT>0</DT>
</DL></I></TD>
</TR>
<TR></TR>
<TR><TD WIDTH="8%" VALIGN="TOP">
<H4>9. </H4></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4>
<H4>AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</H4>
<I><DL>
<DT>2,427,180</DT>
</DL></I></TD>
</TR>
<TR><TD WIDTH="8%" VALIGN="TOP">
<B><P>10. </B></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4>
<B><P>CHECK BOX IF AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES&#9;&#9;&#9;&#9;&#9;&#9;&#9;&#9;&#9;<FONT FACE="Wingdings">&#111;</FONT>
</B></TD>
</TR>
<TR><TD WIDTH="8%" VALIGN="TOP">
<B><P>11. </B></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4>
<B><DL>
<DT>PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)</DT>
</B><I><DT>7.88%</DT>
</DL></I></TD>
</TR>
<TR><TD WIDTH="8%" VALIGN="TOP">
<B><P>12. </B></TD>
<TD WIDTH="92%" VALIGN="TOP" COLSPAN=4>
<B><P>TYPE OF REPORTING PERSON</B><I> </P>
</I><ADDRESS>IA</ADDRESS></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<P>&nbsp;<B>Item 1(a).&#9;</B></TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<B><P>Name of Issuer:</P>
</B><ADDRESS>Mesa Air Group Inc</ADDRESS></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<B><P>Item 1(b).</P>
</B></TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<B><P>Address of Issuers Principal Executive Offices:</P>
</B><ADDRESS>410 North 44th St</ADDRESS>
<I><P>Ste 700</P>
<P>Phoenix, AZ  85008</I></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<B><P>Item 2(a).</B></TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<B><P>Name of Person Filing:</P>
</B><ADDRESS>State Street Research &amp; Management Company</ADDRESS></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<B><P>Item 2(b).</B></TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<B><P>Address of Principal Business Office, or if None, Residence:</P>
</B><I><P>One Financial Center, 31st Floor</P>
</I><ADDRESS>Boston, MA 02111-2690</ADDRESS></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<B><P>Item 2(c).</B></TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<B><P>Citizenship</P>
</B><ADDRESS>Delaware corporation</ADDRESS></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<B><P>Item 2(d).</B></TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<B><P>Title of Class of Securities</P>
</B><ADDRESS>Common Stock</ADDRESS></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<B><P>Item 2(e).</B></TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<B><P>CUSIP Number</P>
</B><ADDRESS>590479101</ADDRESS></TD>
</TR>
<TR><TD WIDTH="13%" VALIGN="TOP" COLSPAN=2>
<B><P>Item 3.&#9;</P>
</B><P ALIGN="RIGHT">&nbsp;</P>
<P ALIGN="RIGHT">&nbsp;</TD>
<TD WIDTH="87%" VALIGN="TOP" COLSPAN=3>
<H4>If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:</H4>
<FONT SIZE=3><DL>
<DT>(a) <FONT FACE="Wingdings">&#111;</FONT>
&#9;Broker or dealer registered under Section 15 of the Exchange Act.</DT>
</DL>
<P>(b) <FONT FACE="Wingdings">&#111;</FONT>
&#9;Bank as defined in Section 3(a)(6) of the Exchange Act.&#9;&#9; </P>
<P>(c) <FONT FACE="Wingdings">&#111;</FONT>
&#9;Insurance Company registered under Section 3(a)(19) of the Exchange Act.</P>
<P>(d) <FONT FACE="Wingdings">&#111;</FONT>
&#9;Investment company registered under Section 8 of the Investment Company Act.</P>
<P>(e) <FONT FACE="Wingdings">&#120;</FONT>
&#9;An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);</P><DIR>
<DIR>

<P>(f) <FONT FACE="Wingdings">&#111;</FONT>
&#9;An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);</P>
<P>(g) <FONT FACE="Wingdings">&#111;</FONT>
&#9;A parent holding company or control person in accordance with </FONT>Rule 13d-1(b)(1)(ii)(G);</P>
<FONT SIZE=3><P>(h) <FONT FACE="Wingdings">&#111;</FONT>
&#9;A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;</P>
<P>(i) <FONT FACE="Wingdings">&#111;</FONT>
&#9;A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;</P>
<P>(j) <FONT FACE="Wingdings">&#111;</FONT>
&#9;Group, in accordance with Rule 13d-1(b)(1)(ii)(J).</DIR>
</DIR>
</FONT></TD>
</TR>
</TABLE>

<FONT FACE="Courier New" SIZE=2><P>&#9;&#9;</P>
<P>&nbsp;</FONT><B>Item 4.</B>&#9;Ownership</P>
<P>Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.</P>
<TABLE CELLSPACING=0 BORDER=0 CELLPADDING=7 WIDTH=642>
<TR><TD VALIGN="TOP">
<B><P>(a) Amount beneficially owned:</B> &#9;<I>2,427,180</I></TD>
</TR>
<TR><TD VALIGN="TOP">
<B><P>(b) Percent of Class:&#9;&#9;</B><I>7.88%</I></TD>
</TR>
<TR><TD VALIGN="TOP">
<B><DL>
<DT>(c) Number of shares as to which such person has:</DT>
</DL></B></TD>
</TR>
<TR><TD VALIGN="TOP"><DIR>

<DL>
<DT>(i) sole power to vote or to direct the vote: &#9;<I>2,427,180</DT>
</DL></DIR>
</I></TD>
</TR>
<TR><TD VALIGN="TOP"><DIR>

<P>(ii) shared power to vote or to direct the vote: <I>&#9;0</DIR>
</I></TD>
</TR>
<TR><TD VALIGN="TOP"><DIR>

<DL>
<DT>(iii) sole power to dispose or to direct the disposition of: &#9;<I>2,427,180</DT>
</DL></DIR>
</I></TD>
</TR>
<TR><TD VALIGN="TOP"><DIR>

<P>(iv) shared power to dispose or direct the disposition of:&#9;&#9;<I>0</DIR>
</I></TD>
</TR>
</TABLE>

<ADDRESS>None of the shares listed above are owned of record by State Street Research &amp; Management Company (&quot;State Street Research&quot;).  The shares listed above are owned of record by certain mutual funds and/or institutional accounts  managed by State Street Research as investment advisor.  State Street Research disclaims any beneficial interest in such shares.  </ADDRESS>
<H4>Item 5.&#9;Ownership of Five Percent or Less of a Class.</H4>
<P>If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ].</P>
<H4>Item 6.&#9;Ownership of More than Five Percent on Behalf of Another Person.</H4>
<P>If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than five percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of an employee benefit plan, pension fund or endowment fund is not required.</P>
<I><P>See response to Item 5 above.</I>&nbsp;</P><DIR>
<DIR>
<DIR>

<B><P>Item 7.&#9;Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.</P></DIR>
</DIR>
</DIR>

</B><P>If a parent holding company or control person has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company or control person has filed this schedule pursuant to Rule 13d-1(c) or 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.</P>
<I><P>Not Applicable</I>&nbsp;</P>
<H4>Item 8. &#9;Identification and Classification of Members of the Group.</H4>
<P>If a group has filed this schedule pursuant to Rule 13d-1(b)(ii)(J), so indicate under Item 3(b) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to Rule 13d-1(c), attach an exhibit stating the identity of each member of the group.</P>
<I><P>Not Applicable</I>&nbsp;</P>
<H4>Item 9. &#9;Notice of Dissolution of Group</H4>
<P> &#9;Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group in their individual capacity.</P>
<H4>Item 10. &#9;Certification</H4>
<P>&nbsp;&#9;By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having such purposes or effect.</P>
<B><U><P>&nbsp;</P>
</U><P ALIGN="CENTER">&nbsp;</P>
</B><P>&nbsp;</P>
<B><P ALIGN="CENTER">SIGNATURE</P>
</B><P>After reasonable inquire and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.</P>

<U><DL>
<DT>1/26/05</DT>
</U><DT>(Date)</DT>
</DL>

<U><P>/s/ Mary T. Lomasney&#9;</P>
</U><P>(Signature)</P>
<DL>
<DT></DT>
<U><DT>Mary T. Lomasney / Senior Vice President, Director of Compliance</DT>
</DL>
</U><P>(Name/Title)</P>
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