Condensed Statements Of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating revenues:
Passenger	$ 296,401	$ 308,573	$ 569,027	$ 582,039
Non-ticket	287,732	244,848	553,249	464,737
Total operating revenues	584,133	553,421	1,122,276	1,046,776
Operating expenses:
Aircraft fuel	113,192	127,907	199,174	240,333
Salaries, wages and benefits	112,930	97,037	229,340	186,094
Aircraft rent	49,864	53,127	102,066	105,915
Landing fees and other rents	39,944	33,364	74,751	63,910
Distribution	24,692	22,349	47,625	42,846
Maintenance, materials and repairs	20,627	21,271	41,567	40,431
Depreciation and amortization	24,957	17,139	48,066	32,002
Other operating	67,511	58,173	131,556	101,920
Loss on disposal of assets	529	415	743	1,010
Special charges	8,052	324	24,254	749
Total operating expenses	462,298	431,106	899,142	815,210
Operating income	121,835	122,315	223,134	231,566
Other (income) expense:
Interest expense	10,166	4,419	18,226	7,231
Capitalized interest	(2,771)	(2,829)	(6,096)	(5,362)
Interest income	(1,447)	(177)	(3,013)	(311)
Other expense	157	44	227	116
Total other (income) expense	6,105	1,457	9,344	1,674
Income before income taxes	115,730	120,858	213,790	229,892
Provision for income taxes	42,646	44,154	78,786	84,186
Net income	$ 73,084	$ 76,704	$ 135,004	$ 145,706
Basic earnings per share (in dollars per share)	$ 1.03	$ 1.06	$ 1.90	$ 2.00
Diluted earnings per share (in dollars per share)	$ 1.03	$ 1.05	$ 1.89	$ 1.99