CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net Income	$ 244.5	$ 251.1	$ 121.6
Adjustments to reconcile net income to net cash provided by operating activities:
Fleet transition and restructuring related charges	38.9	13.2	24.3
Depreciation and amortization	246.9	230.5	219.2
Stock-based compensation and other	16.5	9.1	12.9
Changes in certain assets and liabilities:
Changes in fair values of open fuel hedge contracts	14.4	(14.3)	(88.7)
Changes in deferred income taxes	144.8	145.3	84.1
Increase (decrease) in air traffic liability	67.0	56.1	(6.4)
Increase (decrease) in deferred revenue	6.7	(31.6)	17.3
Increase (decrease) in other long-term liabilities	69.9	28.7	69.1
Pension contribution	(140.8)	(150.5)	(152.8)
Other - net	(12.8)	15.1	(8.1)
Net cash provided by operating activities	696.0	552.7	292.5
Property and equipment additions:
Aircraft and aircraft purchase deposits	(317.8)	(138.6)	(367.2)
Other flight equipment	(35.2)	(27.2)	(30.6)
Other property and equipment	(34.4)	(19.5)	(40.6)
Total property and equipment additions	(387.4)	(185.3)	(438.4)
Assets constructed for others (Terminal 6 at LAX)	(108.9)	(29.0)	0
Purchases of marketable securities	(883.5)	(1,022.0)	(942.6)
Sales and maturities of marketable securities	955.7	931.0	725.0
Proceeds from disposition of assets and changes in restricted deposits	20.8	10.1	(1.4)
Net cash used in investing activities	(403.3)	(295.2)	(657.4)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	106.5	0	275.0
Proceeds from sale-leaseback transactions, net	0	0	230.0
Long-term debt payments	(333.5)	(321.0)	(261.0)
Purchase of treasury stock	(79.5)	(45.1)	(23.8)
Proceeds and tax benefit from issuance of common stock	19.4	36.5	13.0
Other financing activities	7.1	(2.6)	12.8
Net cash (used in) provided by financing activities	(280.0)	(332.2)	246.0
Net increase (decrease) in cash and cash equivalents	12.7	(74.7)	(118.9)
Cash and cash equivalents at beginning of year	89.5	164.2	283.1
Cash and cash equivalents at end of year	102.2	89.5	164.2
Cash paid (refunded) during the year for:
Interest (net of amount capitalized)	73.6	106.0	94.6
Income taxes	7.5	0.4	(8.8)
Non-cash transactions:
Relocation credit and assets constructed related to Terminal 6 at LAX	$ 15.6	$ 7.4	$ 0

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