<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE JUNE 30, 1997 CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF INCOME FOR THE SIX-MONTH PERIOD ENDED JUNE 30, 1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS AND THE FOOTNOTES THERETO. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> JUN-30-1997 <CASH> 435,136 <SECURITIES> 167,009 <RECEIVABLES> 1,633,239 <ALLOWANCES> 38,583 <INVENTORY> 0 <CURRENT-ASSETS> 2,983,667 <PP&E> 13,914,001 <DEPRECIATION> 4,516,788 <TOTAL-ASSETS> 17,312,741 <CURRENT-LIABILITIES> 3,420,173 <BONDS> 6,520,035 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 507,102 <OTHER-SE> 3,668,552 <TOTAL-LIABILITY-AND-EQUITY> 17,312,741 <SALES> 0 <TOTAL-REVENUES> 4,525,617 <CGS> 0 <TOTAL-COSTS> 3,185,832 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 14,718 <INTEREST-EXPENSE> 198,285 <INCOME-PRETAX> 623,621 <INCOME-TAX> 265,185 <INCOME-CONTINUING> 358,436 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 358,436 <EPS-PRIMARY> 0.75 <EPS-DILUTED> 0.00