<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEET AND CONDENSED CONSOLIDATED STATEMENT OF
INCOME ON PAGES 3-5 OF THE COMPANY'S FORM 10Q 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> 99,696
<SECURITIES> 0
<RECEIVABLES> 2,144,740
<ALLOWANCES> 62,042
<INVENTORY> 239,101
<CURRENT-ASSETS> 2,708,513
<PP&E> 11,425,356
<DEPRECIATION> 6,026,968
<TOTAL-ASSETS> 9,056,700
<CURRENT-LIABILITIES> 2,293,671
<BONDS> 1,038,491
0
0
<COMMON> 0
<OTHER-SE> 3,912,451
<TOTAL-LIABILITY-AND-EQUITY> 9,056,700
<SALES> 0
<TOTAL-REVENUES> 3,915,681
<CGS> 0
<TOTAL-COSTS> 3,657,953
<OTHER-EXPENSES> 1,878
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 19,313
<INCOME-PRETAX> 236,537
<INCOME-TAX> 91,067
<INCOME-CONTINUING> 145,470
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 145,470
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>