DERIVATIVE INSTRUMENTS (TABLES)

3 Months Ended

Mar. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Fair values of derivative instruments on the consolidated balance sheet (in millions):

	March 31, 2012			December 31, 2011
Derivative Instruments Not Designated as Hedges
Fuel hedge contracts
Fuel hedge contracts, current assets	$	58.7		$	46.7
Fuel hedge contracts, noncurrent assets	72.8			70.2
Fuel hedge contracts, current liabilities	—			(10.3		)
Derivative Instruments Designated as Hedges
Interest rate swaps
Other accrued liabilities	(5.2		)	(5.2		)
Other liabilities	(20.4		)	(23.6		)
Gains (losses) in AOCL	3.2			(20.0		)

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]

Pretax effect of derivative instruments on earnings (in millions):

	Three Months Ended March 31,
	2012			2011
Derivative Instruments Not Designated as Hedges
Fuel hedge contracts
Gains (losses) recognized in aircraft fuel expense	$	18.5		$	94.5
Derivative Instruments Designated as Hedges
Interest rate swaps
Gains (losses) recognized in aircraft rent	(1.5		)	(1.5		)