<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> MAR-31-1999 <PERIOD-END> SEP-30-1998 <CASH> 11,000 <SECURITIES> 0 <RECEIVABLES> 376,000 <ALLOWANCES> 0 <INVENTORY> 354,700 <CURRENT-ASSETS> 0 <PP&E> 1,167,300 <DEPRECIATION> (442,300) <TOTAL-ASSETS> 1,603,600 <CURRENT-LIABILITIES> 0 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 43,500 <OTHER-SE> 919,600 <TOTAL-LIABILITY-AND-EQUITY> 1,603,600 <SALES> 0 <TOTAL-REVENUES> 1,428,900 <CGS> 0 <TOTAL-COSTS> 1,199,200 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 9,200 <INCOME-PRETAX> 164,100 <INCOME-TAX> 61,500 <INCOME-CONTINUING> 102,600 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 102,600 <EPS-PRIMARY> 2.36 <EPS-DILUTED> 2.33