Commitments and Contingencies - Fixed Maintenance Reserve Payments and Other Commitments (Details) (USD $)	Sep. 30, 2014
Reservation System and Advertising Media [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 900,000
Unrecorded Unconditional Purchase Obligation, Due in 2015	3,900,000
Unrecorded Unconditional Purchase Obligation, Due in 2016	3,900,000
Unrecorded Unconditional Purchase Obligation, Due in 2017	3,900,000
Unrecorded Unconditional Purchase Obligation, Due in 2018	2,600,000
Unrecorded Unconditional Purchase Obligation, Due in 2019 and beyond	0
Aircraft and Related Flight Equipment [Member] | Fixed Maintenance Reserve Payments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	1,800,000
Unrecorded Unconditional Purchase Obligation, Due in 2015	7,600,000
Unrecorded Unconditional Purchase Obligation, Due in 2016	8,000,000
Unrecorded Unconditional Purchase Obligation, Due in 2017	7,400,000
Unrecorded Unconditional Purchase Obligation, Due in 2018	5,800,000
Unrecorded Unconditional Purchase Obligation, Due in 2019 and beyond	$ 18,400,000