Condensed Statements Of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income	$ 169,555	$ 133,725
Adjustments to reconcile net income to net cash provided by operations:
Unrealized (gains) losses on open fuel hedge contracts	0	3,489
Equity-based compensation, net	6,315	3,970
Allowance for doubtful accounts	(63)	128
Amortization of deferred gains and losses	(228)	(452)
Depreciation and amortization	33,803	22,403
Deferred income tax	(395)	8,795
Loss on disposal of assets	1,658	426
Capitalized interest	(1,088)	(140)
Changes in operating assets and liabilities:
Accounts receivable	(3,206)	(5,038)
Prepaid maintenance reserves	(28,955)	(10,166)
Long-term deposits and other assets	(36,449)	(37,062)
Accounts payable	(5,524)	(1,206)
Air traffic liability	48,736	49,318
Other liabilities	22,136	5,441
Net cash provided by operating activities	206,295	173,631
Investing activities:
Pre-delivery deposits for flight equipment, net of refunds	(115,955)	(41,328)
Purchase of property and equipment	(26,261)	(17,028)
Net cash used in investing activities	(142,216)	(58,356)
Financing activities:
Proceeds from stock options exercised	140	675
Payments on capital lease obligations	(922)	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	1,690	1,635
Repurchase of common stock	(1,501)	(1,106)
Net cash (used in) provided by financing activities	(6,236)	8,104
Net increase in cash and cash equivalents	57,843	123,379
Cash and cash equivalents at beginning of period	530,631	416,816
Cash and cash equivalents at end of period	588,474	540,195
Cash payments for:
Interest	398	26
Taxes	$ 88,884	$ 60,942