
<TABLE> <S> <C>

<ARTICLE>                                 5
<MULTIPLIER>                              1000
       
<S>                                       <C>
<PERIOD-TYPE>                             9-MOS
<FISCAL-YEAR-END>                         DEC-31-1996
<PERIOD-END>                              SEP-30-1997
<CASH>                                         134,923
<SECURITIES>                                         0
<RECEIVABLES>                                  279,797
<ALLOWANCES>                                     8,117
<INVENTORY>                                     32,297
<CURRENT-ASSETS>                               551,783
<PP&E>                                       2,139,101
<DEPRECIATION>                                 702,015
<TOTAL-ASSETS>                               2,207,383
<CURRENT-LIABILITIES>                          596,491
<BONDS>                                        417,320
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       262,401
<OTHER-SE>                                     523,840
<TOTAL-LIABILITY-AND-EQUITY>                 2,207,383
<SALES>                                      1,461,437
<TOTAL-REVENUES>                             1,461,437
<CGS>                                                0
<TOTAL-COSTS>                                1,404,066
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                 7,826
<INTEREST-EXPENSE>                              33,853
<INCOME-PRETAX>                                 54,286
<INCOME-TAX>                                    18,772
<INCOME-CONTINUING>                             35,514
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    35,514
<EPS-PRIMARY>                                        0.99
<EPS-DILUTED>                                        0.99
        


</TABLE>
