<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> JUN-30-1997 <CASH> 123,128 <SECURITIES> 0 <RECEIVABLES> 705,772 <ALLOWANCES> (8,815) <INVENTORY> 134,710 <CURRENT-ASSETS> 1,260,099 <PP&E> 3,504,869 <DEPRECIATION> (784,056) <TOTAL-ASSETS> 5,815,706 <CURRENT-LIABILITIES> 977,679 <BONDS> 1,271,200 <PREFERRED-MANDATORY> 1 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 2,672,055 <TOTAL-LIABILITY-AND-EQUITY> 5,815,706 <SALES> 0 <TOTAL-REVENUES> 1,164,488 <CGS> 0 <TOTAL-COSTS> 787,129 <OTHER-EXPENSES> 0 <LOSS-PROVISION> (2,230) <INTEREST-EXPENSE> 31,564 <INCOME-PRETAX> 180,779 <INCOME-TAX> 43,017 <INCOME-CONTINUING> 137,762 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 137,762 <EPS-PRIMARY> 0.00 <EPS-DILUTED> 0.00