<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED STATEMENTS OF INCOME AND CONSOLIDATED BALANCE SHEETS ON PAGES
F-2 THROUGH F-4 OF THE COMPANY'S 10-K FOR THE YEAR ENDED MAY 31, 2000 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAY-31-2000
<PERIOD-START> JUN-01-1999
<PERIOD-END> MAY-31-2000
<CASH> 88,630
<SECURITIES> 0
<RECEIVABLES> 2,145,371
<ALLOWANCES> 56,517
<INVENTORY> 247,372
<CURRENT-ASSETS> 2,741,797
<PP&E> 12,958,570
<DEPRECIATION> 6,846,647
<TOTAL-ASSETS> 9,740,539
<CURRENT-LIABILITIES> 2,421,868
<BONDS> 1,054,430
0
0
<COMMON> 0
<OTHER-SE> 4,366,267
<TOTAL-LIABILITY-AND-EQUITY> 9,740,539
<SALES> 0
<TOTAL-REVENUES> 15,068,338
<CGS> 0
<TOTAL-COSTS> 14,168,728
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 75,580
<INCOME-PRETAX> 843,547
<INCOME-TAX> 333,201
<INCOME-CONTINUING> 510,346
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 510,346
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>