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DERIVATIVE INSTRUMENTS - INCOME STATEMENT (DETAILS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivatvie Instruments Not Designated as Hedges [Member] \| Fuel hedge contracts [Member] \| Gains (losses) recognized in aircraft fuel expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (losses) recognized in income	$ (8.7)	$ (2.0)	$ 28.1
Cash Flow Hedging [Member] \| Derivatvie Instruments Designated as Hedges [Member] \| Interest rate swaps agreements [Member] \| Gains (losses) recognized in aircraft rent [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (losses) recognized in income	$ (6.2)	$ (6.1)	$ (1.6)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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