<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED STATEMENT OF INCOME AND THE CONSOLIDATED BALANCE SHEET AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THOSE FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                          10,500
<SECURITIES>                                         0
<RECEIVABLES>                                  269,100
<ALLOWANCES>                                         0
<INVENTORY>                                     10,400
<CURRENT-ASSETS>                               323,400
<PP&E>                                       6,261,200
<DEPRECIATION>                               4,035,100
<TOTAL-ASSETS>                               2,632,000
<CURRENT-LIABILITIES>                          268,600
<BONDS>                                      1,067,700
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         1,000
<OTHER-SE>                                     737,600
<TOTAL-LIABILITY-AND-EQUITY>                 2,632,000
<SALES>                                        783,200
<TOTAL-REVENUES>                               837,200
<CGS>                                          505,400
<TOTAL-COSTS>                                  628,800
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              59,700
<INCOME-PRETAX>                                109,900
<INCOME-TAX>                                  (28,500)
<INCOME-CONTINUING>                            138,400
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   138,400
<EPS-BASIC>                                     1.42
<EPS-DILUTED>                                     1.40