Condensed Statements Of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating revenues:
Passenger	$ 317,038	$ 279,499	$ 873,403	$ 739,515
Non-ticket	202,731	177,126	583,690	494,886
Total operating revenues	519,769	456,625	1,457,093	1,234,401
Operating expenses:
Aircraft fuel	171,584	144,986	474,907	411,903
Salaries, wages and benefits	79,087	66,805	232,776	192,758
Aircraft rent	50,009	42,134	144,618	125,121
Landing fees and other rents	27,735	22,106	77,582	61,508
Distribution	20,202	17,916	58,930	50,874
Maintenance, materials and repairs	19,622	16,908	56,441	43,890
Depreciation and amortization	11,338	8,475	33,803	22,403
Other operating	39,190	38,884	111,045	110,799
Loss on disposal of assets	793	165	1,658	426
Special charges (credits)	18	442	45	488
Total operating expenses	419,578	358,821	1,191,805	1,020,170
Operating income	100,191	97,804	265,288	214,231
Other (income) expense:
Interest expense	878	36	1,088	140
Capitalized interest	(878)	(36)	(1,088)	(140)
Interest income	(84)	(87)	(235)	(308)
Other expense	81	115	1,557	252
Total other (income) expense	(3)	28	1,322	(56)
Income before income taxes	100,194	97,776	263,966	214,287
Provision for income taxes	33,194	36,673	94,411	80,562
Net income	$ 67,000	$ 61,103	$ 169,555	$ 133,725
Basic earnings per share (in dollars per share)	$ 0.92	$ 0.84	$ 2.33	$ 1.84
Diluted earnings per share (in dollars per share)	$ 0.91	$ 0.84	$ 2.31	$ 1.83