Commitments (Details 2)	Nov. 30, 2012
Schedule of Aircraft Commitments [Line Items]
2013 (remainder)	5
2014	6
2015	10
2016	10
2017	10
Thereafter	30
Total	71
Boeing 777 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2014	2
2015	2
Thereafter	16
Total	20
Boeing 757 [Member]
Schedule of Aircraft Commitments [Line Items]
2013 (remainder)	5
Total	5
Boeing 767 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2014	4
2015	8
2016	10
2017	10
Thereafter	14
Total	46