<ARTICLE> 5
<MULTIPLIER> 1000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                           90690
<SECURITIES>                                      2822
<RECEIVABLES>                                   526503
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                202901
<PP&E>                                          822908
<DEPRECIATION>                                  477134
<TOTAL-ASSETS>                                 2154260
<CURRENT-LIABILITIES>                          1483498
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        188421
<OTHER-SE>                                    (607765)
<TOTAL-LIABILITY-AND-EQUITY>                   2154260
<SALES>                                              0
<TOTAL-REVENUES>                               1511134
<CGS>                                                0
<TOTAL-COSTS>                                  1189382
<OTHER-EXPENSES>                                (2340)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               39979
<INCOME-PRETAX>                                 267665
<INCOME-TAX>                                     91809
<INCOME-CONTINUING>                             175856
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    175856
<EPS-PRIMARY>                                     1.03
<EPS-DILUTED>                                     1.03