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Summary of Quarterly Operating Results (Unaudited)
12 Months Ended
May 31, 2012
Summary of Quarterly Operating Results [Abstract]  
Summary of Quarterly Operating Results (Unaudited)

NOTE 16: SUMMARY OF QUARTERLY OPERATING RESULTS (UNAUDITED)

  First Second Third Fourth  
(in millions)Quarter Quarter Quarter Quarter  
               
2012(1)             
Revenues$ 6,409   6,406 $ 6,363 $ 6,588  
Operating income  282   339   351   276  
Net income  185   221   231   171  
               
2011(2)             
Revenues$ 5,769   5,841 $ 5,914 $ 6,466  
Operating income  351   255   176   424  
Net income  212   152   100   267  
               
(1) The fourth quarter of 2012 includes an impairment charge of $134 million resulting from the decision to retire 24 aircraft and related engines. The third quarter of 2012 includes the reversal of a $66 million legal reserve associated with the ATA Airlines lawsuit.
               
(2) The second quarter of 2011 includes a $66 million legal reserve associated with the ATA Airlines lawsuit.