<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE MARCH 31, 1998 CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF INCOME FOR THE THREE-MONTH PERIOD ENDED MARCH 31, 1998, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS AND THE FOOTNOTES THERETO. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> MAR-31-1998 <CASH> 311,861 <SECURITIES> 3,053 <RECEIVABLES> 1,517,915 <ALLOWANCES> 54,161 <INVENTORY> 0 <CURRENT-ASSETS> 2,179,626 <PP&E> 11,793,089 <DEPRECIATION> 4,666,663 <TOTAL-ASSETS> 13,864,000 <CURRENT-LIABILITIES> 4,509,073 <BONDS> 5,398,132 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 507,102 <OTHER-SE> 847,791 <TOTAL-LIABILITY-AND-EQUITY> 13,864,000 <SALES> 0 <TOTAL-REVENUES> 2,131,621 <CGS> 0 <TOTAL-COSTS> 1,621,985 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 7,243 <INTEREST-EXPENSE> 115,574 <INCOME-PRETAX> 170,968 <INCOME-TAX> 96,551 <INCOME-CONTINUING> 74,417 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 74,417 <EPS-PRIMARY> 0.16 <EPS-DILUTED> 0.16