Condensed Statements Of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating revenues:
Passenger	$ 302,487	$ 241,119	$ 556,365	$ 460,016
Non-ticket	196,850	166,220	380,959	317,760
Total operating revenues	499,337	407,339	937,324	777,776
Operating expenses:
Aircraft fuel	154,852	135,251	303,323	266,917
Salaries, wages and benefits	77,440	64,456	153,689	125,953
Aircraft rent	48,222	41,915	94,609	82,987
Landing fees and other rents	25,831	21,346	49,847	39,402
Distribution	20,159	17,277	38,728	32,958
Maintenance, materials and repairs	19,205	15,202	36,819	26,982
Depreciation and amortization	11,344	7,604	22,465	13,928
Other operating	36,408	37,416	71,856	71,915
Loss on disposal of assets	715	91	865	261
Special charges (credits)	17	23	26	46
Total operating expenses	394,193	340,581	772,227	661,349
Operating income	105,144	66,758	165,097	116,427
Other (income) expense:
Interest expense	103	95	210	104
Capitalized interest	(103)	(95)	(210)	(104)
Interest income	(83)	(105)	(151)	(221)
Other expense	1,439	36	1,476	137
Total other (income) expense	1,356	(69)	1,325	(84)
Income before income taxes	103,788	66,827	163,772	116,511
Provision for income taxes	38,939	24,759	61,217	43,889
Net income	$ 64,849	$ 42,068	$ 102,555	$ 72,622
Basic earnings per share (in dollars per share)	$ 0.89	$ 0.58	$ 1.41	$ 1.00
Diluted earnings per share (in dollars per share)	$ 0.88	$ 0.58	$ 1.40	$ 1.00