Condensed Statements Of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 242,820	$ 169,555
Adjustments to reconcile net income to net cash provided by operations:
Unrealized (gains) losses on open fuel derivative contracts, net	2,239	0
Equity-based compensation, net	6,999	6,315
Allowance for doubtful accounts (recoveries)	7	(63)
Amortization of deferred gains and losses	730	(228)
Depreciation and amortization	51,630	33,803
Deferred income tax expense (benefit)	63,960	(395)
Loss on disposal of assets	1,300	1,658
Capitalized interest	(8,392)	(1,088)
Changes in operating assets and liabilities:
Accounts receivable	(10,374)	(3,206)
Prepaid maintenance reserves	(17,488)	(28,955)
Long-term deposits and other assets	(44,294)	(36,449)
Accounts payable	2,340	(5,524)
Air traffic liability	56,960	48,736
Other liabilities	17,845	22,136
Net cash provided by operating activities	366,282	206,295
Investing activities:
Pre-delivery deposits for flight equipment, net of refunds	(87,658)	(115,955)
Purchase of property and equipment	(451,799)	(26,261)
Net cash used in investing activities	(539,457)	(142,216)
Financing activities:
Proceeds from issuance of long-term debt	416,000	0
Proceeds from stock options exercised	32	140
Payments on debt and capital lease obligations	(16,609)	(922)
Proceeds from sale and leaseback transactions	7,300	0
Payments to pre-IPO shareholders pursuant to tax receivable agreement	0	(5,643)
Excess tax benefits from equity-based compensation	8,818	1,690
Repurchase of common stock	(112,162)	(1,501)
Debt issuance costs	(14,092)	0
Net cash provided by financing activities	289,287	(6,236)
Net increase in cash and cash equivalents	116,112	57,843
Cash and cash equivalents at beginning of period	632,784	530,631
Cash and cash equivalents at end of period	748,896	588,474
Cash payments for:
Interest (net of capitalized interest)	3,851	398
Taxes	$ 95,135	$ 88,884