Condensed Statements Of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating revenues:
Passenger	$ 371,922	$ 296,401	$ 671,684	$ 569,027
Non-ticket	329,760	287,732	621,744	553,249
Total operating revenues	701,682	584,133	1,293,428	1,122,276
Operating expenses:
Salaries, wages and benefits	129,892	112,930	257,030	229,340
Aircraft fuel	142,294	113,192	282,076	199,174
Aircraft rent	52,566	49,864	109,636	102,066
Landing fees and other rents	45,592	39,944	86,040	74,751
Depreciation and amortization	35,331	24,957	66,840	48,066
Maintenance, materials and repairs	28,985	20,627	55,297	41,567
Distribution	29,908	24,692	56,406	47,625
Special charges	0	8,052	4,776	24,254
Loss on disposal of assets	1,493	529	2,598	743
Other operating	102,885	67,511	180,588	131,556
Total operating expenses	568,946	462,298	1,101,287	899,142
Operating income	132,736	121,835	192,141	223,134
Other (income) expense:
Interest expense	13,746	10,166	26,219	18,226
Capitalized interest	(3,342)	(2,771)	(6,922)	(6,096)
Interest income	(1,828)	(1,447)	(3,141)	(3,013)
Other expense	104	157	107	227
Total other (income) expense	8,680	6,105	16,263	9,344
Income before income taxes	124,056	115,730	175,878	213,790
Provision for income taxes	45,913	42,646	65,800	78,786
Net income	$ 78,143	$ 73,084	$ 110,078	$ 135,004
Basic earnings per share (in dollars per share)	$ 1.13	$ 1.03	$ 1.59	$ 1.90
Diluted earnings per share (in dollars per share)	$ 1.12	$ 1.03	$ 1.58	$ 1.89