<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEETS AND CONDENSED CONSOLIDATED STATEMENTS OF
INCOME ON PAGES 3-5 OF THE COMPANY'S FORM 10-Q FOR THE QUARTERLY PERIOD ENDING
AUGUST 31, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> MAY-31-2001
<PERIOD-START> JUN-01-2000
<PERIOD-END> AUG-31-2000
<CASH> 176,589
<SECURITIES> 0
<RECEIVABLES> 2,679,138
<ALLOWANCES> 91,020
<INVENTORY> 260,459
<CURRENT-ASSETS> 3,409,121
<PP&E> 15,019,373
<DEPRECIATION> 7,902,302
<TOTAL-ASSETS> 11,757,759
<CURRENT-LIABILITIES> 2,836,892
<BONDS> 1,894,854
0
0
<COMMON> 29,857
<OTHER-SE> 4,931,705
<TOTAL-LIABILITY-AND-EQUITY> 11,757,759
<SALES> 0
<TOTAL-REVENUES> 4,778,736
<CGS> 0
<TOTAL-COSTS> 4,467,769
<OTHER-EXPENSES> 3,929
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 32,793
<INCOME-PRETAX> 274,245
<INCOME-TAX> 105,585
<INCOME-CONTINUING> 168,660
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 168,660
<EPS-BASIC> .590
<EPS-DILUTED> .580
</TABLE>