Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenue:
Passenger	$ 543,315	$ 497,243	$ 1,464,715	$ 1,326,306
Other	55,983	52,079	159,265	143,061
Total	599,298	549,322	1,623,980	1,469,367
Operating Expenses:
Aircraft fuel, including taxes and delivery	181,334	165,762	525,046	456,545
Wages and benefits	112,150	93,438	318,269	280,261
Aircraft rent	27,575	25,626	81,879	73,712
Maintenance materials and repairs	51,705	44,150	160,000	137,271
Aircraft and passenger servicing	31,080	28,859	89,367	74,859
Commissions and other selling	32,288	31,028	98,285	89,055
Depreciation and amortization	22,092	22,983	60,993	63,687
Other rentals and landing fees	21,996	22,520	60,773	63,486
Other	44,644	40,023	129,469	113,330
Total	524,864	474,389	1,524,081	1,352,206
Operating Income	74,434	74,933	99,899	117,161
Nonoperating Income (Expense):
Interest expense and amortization of debt discounts and issuance costs	(13,479)	(11,975)	(37,019)	(31,745)
Interest income	173	96	426	477
Capitalized interest	3,005	2,579	9,336	7,328
Gains (losses) on fuel derivatives	2,536	6,508	(10,931)	(2,495)
Other, net	749	1,662	(3,457)	1,245
Total	(7,016)	(1,130)	(41,645)	(25,190)
Income Before Income Taxes	67,418	73,803	58,254	91,971
Income tax expense	26,814	28,320	23,479	35,326
Net Income	$ 40,604	$ 45,483	$ 34,775	$ 56,645
Net Income Per Common Stock Share:
Basic (in dollars per share)	$ 0.78	$ 0.88	$ 0.67	$ 1.11
Diluted (in dollars per share)	$ 0.76	$ 0.86	$ 0.65	$ 1.08