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Commitments (Details 2)
Aug. 31, 2013
Schedule of Aircraft Commitments [Line Items]  
2014 (remainder) 22
2015 23
2016 12
2017 10
2018 12
Thereafter 18
Total 97
Boeing 777 Freighter [Member]
 
Schedule of Aircraft Commitments [Line Items]  
2014 (remainder) 2
2016 2
2018 2
Thereafter 14
Total 20
Boeing 757 [Member]
 
Schedule of Aircraft Commitments [Line Items]  
2014 (remainder) 16
2015 11
Total 27
Boeing 767 Freighter [Member]
 
Schedule of Aircraft Commitments [Line Items]  
2014 (remainder) 4
2015 12
2016 10
2017 10
2018 10
Thereafter 4
Total 50