<ARTICLE> 5
<MULTIPLIER> 1
<CURRENCY> U.S. DOLLAR
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<EXCHANGE-RATE>                                      1
<CASH>                                         242,558
<SECURITIES>                                     9,286
<RECEIVABLES>                                  110,765
<ALLOWANCES>                                     3,126
<INVENTORY>                                     33,341
<CURRENT-ASSETS>                               449,051
<PP&E>                                       1,214,769
<DEPRECIATION>                                 448,088
<TOTAL-ASSETS>                               1,674,183
<CURRENT-LIABILITIES>                          668,626
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           464
<OTHER-SE>                                     690,589
<TOTAL-LIABILITY-AND-EQUITY>                 1,674,183
<SALES>                                              0
<TOTAL-REVENUES>                               519,626
<CGS>                                                0
<TOTAL-COSTS>                                  468,911
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                   812
<INTEREST-EXPENSE>                               6,262
<INCOME-PRETAX>                                 46,737
<INCOME-TAX>                                    20,798
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    25,939
<EPS-PRIMARY>                                     0.67<F1>
<EPS-DILUTED>                                     0.63
<FN>
<F1>EPS PRIMARY REPRESENTS BASIC NET INCOME PER SHARE
</FN>