Condensed Statements Of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net income	$ 102,555	$ 72,622
Adjustments to reconcile net income to net cash provided by operations:
Unrealized mark-to-market losses (gains)	0	9,144
Equity-based compensation, net	3,872	2,788
Allowance for doubtful accounts	(33)	156
Amortization of deferred gains and losses	(178)	(324)
Depreciation and amortization	22,465	13,928
Deferred income tax	(395)	5,962
Loss on disposal of assets	865	261
Capitalized interest	(210)	(104)
Changes in operating assets and liabilities:
Accounts receivable	(14,188)	(10,223)
Prepaid maintenance reserves	(14,286)	(16,641)
Long-term deposits and other assets	(27,020)	(36,304)
Accounts payable	(1,462)	(991)
Air traffic liability	64,331	74,374
Other liabilities	7,819	19,612
Net cash provided by operating activities	144,135	134,260
Investing activities:
Pre-delivery deposits for flight equipment, net of refunds	(94,009)	(19,748)
Purchase of property and equipment	(7,430)	(13,816)
Net cash used in investing activities	(101,439)	(33,564)
Financing activities:
Proceeds from options exercised	63	555
Payments on capital lease obligations	(511)	0
Proceeds from sale and leaseback transactions	0	6,900
Payments to pre-IPO shareholders pursuant to tax receivable agreement	(5,643)	0
Excess tax benefits from equity-based compensation	1,225	875
Repurchase of common stock	(1,222)	(937)
Net cash (used in) provided by financing activities	(6,088)	7,393
Net increase in cash and cash equivalents	36,608	108,089
Cash and cash equivalents at beginning of period	530,631	416,816
Cash and cash equivalents at end of period	567,239	524,905
Cash payments for:
Interest	326	17
Taxes	$ 52,093	$ 44,806