CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Operating Revenues
Passenger, Mainline	$ 904.6	$ 835.6	$ 2,490.7	$ 2,269.1
Passenger, Regional	198.1	196.1	558.5	536.7
Total passenger revenue	1,102.7	1,031.7	3,049.2	2,805.8
Freight and mail	29.6	29.9	84.6	83.9
Other - net	139.9	136.5	390.9	383.8
Total Operating Revenues	1,272.2	1,198.1	3,524.7	3,273.5
Operating Expenses
Wages and benefits	255.1	245.1	770.6	737.2
Variable incentive pay	23.7	19.1	61.2	53.4
Aircraft fuel, including hedging gains and losses	336.6	420.1	1,087.2	1,012.1
Aircraft maintenance	55.7	49.9	160.3	152.3
Aircraft rent	29.2	28.8	86.2	88.3
Landing fees and other rentals	61.5	62.0	184.5	179.8
Contracted services	50.3	46.1	148.5	136.2
Selling expenses	45.9	47.4	131.2	133.0
Depreciation and amortization	65.9	62.2	195.4	184.2
Food and beverage service	20.2	17.6	57.6	49.8
Other	58.6	54.6	184.3	173.5
Fleet transition expenses	0	2.0	0	38.9
Total Operating Expenses	1,002.7	1,054.9	3,067.0	2,938.7
Operating Income	269.5	143.2	457.7	334.8
Nonoperating income (expense)
Interest income	4.5	4.5	14.5	18.4
Interest expense	(15.1)	(25.7)	(48.9)	(69.1)
Interest capitalized	4.4	2.1	12.4	5.5
Other - net	2.3	1.2	5.6	3.4
Nonoperating Income (Expense) Total	(3.9)	(17.9)	(16.4)	(41.8)
Income before income tax	265.6	125.3	441.3	293.0
Income tax expense	102.2	47.8	169.6	112.5
Net Income	$ 163.4	$ 77.5	$ 271.7	$ 180.5
Basic Earnings Per Share	$ 2.30	$ 1.08	$ 3.83	$ 2.51
Diluted Earnings Per Share	$ 2.27	$ 1.06	$ 3.77	$ 2.46
Shares used for computation:
Basic	70,963	71,954	70,852	71,968
Diluted	71,883	73,238	72,059	73,450