<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