Leases (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 aircraft	Sep. 30, 2012	Jul. 09, 2012 aircraft
Aircraft Type [Line Items]
Transfer from leased to owned aircraft	2
B-717-200 Aircraft
Aircraft Type [Line Items]
Lessee	Delta Air Lines, Inc.
Total assets available for lease/sublease, number of units			88
Number of Aircraft Expected To Be Converted to Sublease Per Month	3
Operating lease, number of units	76		78
Owned assets, number of units	10
Capital leased assets, number of units	2
Lease terms for owned aircraft	7 years
Contingent payments	$ 0
Residual value	0
Estimated loss on sublease		$ 137,000,000
B-717-200 Aircraft | Remainder of Current Year
Aircraft Type [Line Items]
Number of aircraft expected to be delivered to sublessee	24
Maximum | B-717-200 Aircraft
Aircraft Type [Line Items]
Sublease terms for leased aircraft	9 years
Minimum | B-717-200 Aircraft
Aircraft Type [Line Items]
Sublease terms for leased aircraft	2 years