Condensed Statements Of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating revenues:
Passenger	$ 331,004	$ 319,812	$ 900,031	$ 901,851
Non-ticket	290,325	255,029	843,574	719,766
Total operating revenues	621,329	574,841	1,743,605	1,621,617
Operating expenses:
Aircraft fuel	121,844	115,899	321,018	356,232
Salaries, wages and benefits	120,190	95,081	349,530	281,175
Aircraft rent	49,367	53,525	151,433	159,440
Landing fees and other rents	39,345	34,577	114,096	98,487
Distribution	25,565	23,074	73,190	65,920
Maintenance, materials and repairs	30,443	21,473	72,010	61,904
Depreciation and amortization	25,304	19,628	73,370	51,630
Other operating	66,277	54,151	197,833	156,071
Loss on disposal of assets	423	290	1,166	1,300
Special charges (credits)	7,355	(76)	31,609	673
Total operating expenses	486,113	417,622	1,385,255	1,232,832
Operating income	135,216	157,219	358,350	388,785
Other (income) expense:
Interest expense	11,362	5,951	29,588	13,182
Capitalized interest	(3,067)	(3,030)	(9,163)	(8,392)
Interest income	(1,222)	(233)	(4,235)	(544)
Other expense	180	166	407	282
Total other (income) expense	7,253	2,854	16,597	4,528
Income before income taxes	127,963	154,365	341,753	384,257
Provision for income taxes	46,581	57,251	125,367	141,437
Net income	$ 81,382	$ 97,114	$ 216,386	$ 242,820
Basic earnings per share (in dollars per share)	$ 1.17	$ 1.35	$ 3.06	$ 3.35
Diluted earnings per share (in dollars per share)	$ 1.17	$ 1.35	$ 3.05	$ 3.34