CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
OPERATING REVENUES:
Passenger	$ 826,122	$ 920,633	$ 1,611,993	$ 1,822,989
Ground handling and other	13,008	16,581	30,624	35,399
Total operating revenues	839,130	937,214	1,642,617	1,858,388
OPERATING EXPENSES:
Salaries, wages and benefits	300,342	290,676	597,738	581,490
Aircraft maintenance, materials and repairs	171,528	167,150	338,684	346,786
Aircraft rentals	81,814	83,944	164,402	168,846
Depreciation and amortization	61,174	64,182	122,174	128,497
Aircraft fuel	46,802	153,544	96,483	300,994
Station rentals and landing fees	36,998	44,254	71,086	88,187
Ground handling services	33,117	29,615	67,694	64,930
Other	56,800	57,043	118,238	111,395
Total operating expenses	788,575	890,408	1,576,499	1,791,125
OPERATING INCOME	50,555	46,806	66,118	67,263
OTHER INCOME (EXPENSE):
Interest income	870	2,043	2,597	3,996
Interest expense	(17,526)	(19,387)	(35,491)	(39,167)
Other, net	(187)	(815)	5,852	(4,667)
Total other expense, net	(16,843)	(18,159)	(27,042)	(39,838)
INCOME BEFORE INCOME TAXES	33,712	28,647	39,076	27,425
PROVISION FOR INCOME TAXES	12,992	11,687	15,121	11,147
NET INCOME	20,720	16,960	23,955	16,278
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.40	$ 0.33	$ 0.46	$ 0.32
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.39	$ 0.33	$ 0.46	$ 0.32
Weighted average common shares:
Basic (in shares)	51,881	50,944	51,822	50,912
Diluted (in shares)	52,547	51,789	52,522	51,335
Dividends declared per share (in dollars per share)	$ 0.04	$ 0.04	$ 0.08	$ 0.08
COMPREHENSIVE INCOME:
Net income	20,720	16,960	23,955	16,278
Proportionate share of other companies foreign currency translation adjustment, net of taxes		141		448
Net unrealized appreciation (depreciation) on marketable securities, net of taxes	(563)	35	(499)	111
TOTAL COMPREHENSIVE INCOME	$ 20,157	$ 17,136	$ 23,456	$ 16,837