CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating Revenues
Passenger, Mainline	$ 862.7	$ 774.2	$ 1,586.1	$ 1,433.5
Passenger, Regional	187.6	179.0	360.4	340.6
Total passenger revenue	1,050.3	953.2	1,946.5	1,774.1
Freight and mail	30.6	29.1	55.0	54.0
Other - net	132.3	127.9	251.0	247.3
Total Operating Revenues	1,213.2	1,110.2	2,252.5	2,075.4
Operating Expenses
Wages and benefits	258.9	242.8	515.5	492.1
Variable incentive pay	21.5	17.9	37.5	34.3
Aircraft fuel, including hedging gains and losses	431.8	397.5	750.6	592.0
Aircraft maintenance	54.5	49.1	104.6	102.4
Aircraft rent	29.0	29.0	57.0	59.5
Landing fees and other rentals	60.5	59.9	123.0	117.8
Contracted services	50.5	46.6	98.2	90.1
Selling expenses	44.2	45.8	85.3	85.6
Depreciation and amortization	65.8	61.7	129.5	122.0
Food and beverage service	19.6	17.1	37.4	32.2
Other	61.1	58.2	125.7	118.9
Fleet transition expenses	0	26.8	0	36.9
Total Operating Expenses	1,097.4	1,052.4	2,064.3	1,883.8
Operating Income	115.8	57.8	188.2	191.6
Nonoperating income (expense)
Interest income	5.1	6.3	10.0	13.9
Interest expense	(17.2)	(20.0)	(33.8)	(43.4)
Interest capitalized	3.5	1.6	8.0	3.4
Other - net	1.9	1.3	3.3	2.2
Nonoperating Income (Expense) Total	(6.7)	(10.8)	(12.5)	(23.9)
Income before income tax	109.1	47.0	175.7	167.7
Income tax expense	41.6	18.2	67.4	64.7
Net Income	$ 67.5	$ 28.8	$ 108.3	$ 103.0
Basic Earnings Per Share	$ 0.95	$ 0.40	$ 1.52	$ 1.43
Diluted Earnings Per Share	$ 0.93	$ 0.39	$ 1.50	$ 1.40
Shares used for computation:
Basic	70,996	71,965	71,069	71,977
Diluted	72,200	73,473	72,325	73,551