Commitments (Details 2)	Nov. 30, 2011
Schedule of Aircraft Commitments [Line Items]
2012 (remainder)	10
2013	10
2014	7
2015	3
2016	3
Thereafter	9
Total	42
Boeing 777 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2012 (remainder)	2
2013	4	[1]
2014	7
2015	3
2016	3
Thereafter	9	[1]
Total	28
Boeing 757 [Member]
Schedule of Aircraft Commitments [Line Items]
2012 (remainder)	8
2013	6
Total	14

[1] Reflects the deferral during the second quarter of 2012 of the delivery of two B777F aircraft from 2013 to after 2016.