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DERIVATIVE INSTRUMENTS (TABLES)
 6 Months Ended
Jun. 30, 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):
 
June 30,
2012
 
December 31,
2011
Derivative Instruments Not Designated as Hedges
 
 
 
Fuel hedge contracts
 
 
 
Fuel hedge contracts, current assets
$
22.0

 
$
46.7

Fuel hedge contracts, noncurrent assets
39.3

 
70.2

Fuel hedge contracts, current liabilities
—

 
(10.3
)
 
 
 
 
Derivative Instruments Designated as Hedges
 
 
 
Interest rate swaps
 
 
 
Other accrued liabilities
(5.7
)
 
(5.2
)
Other liabilities
(26.3
)
 
(23.6
)
Losses in Accumulated Other Comprehensive Loss (AOCL)
(32.0
)
 
(28.8
)
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 June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Derivative Instruments Not Designated as Hedges
 
 
 
 
 
 
 
Fuel hedge contracts
 
 
 
 
 
 
 
Gains (losses) recognized in aircraft fuel expense
$
(81.4
)
 
$
(54.4
)
 
$
(62.9
)
 
$
40.1

 
 
 
 
 
 
 
 
Derivative Instruments Designated as Hedges
 
 
 
 
 
 
 
Interest rate swaps
 
 
 
 
 
 
 
Losses recognized in aircraft rent
(1.4
)
 
(1.6
)
 
(2.9
)
 
(3.1
)
Losses recognized in Other Comprehensive Income (OCI)
(7.8
)
 
(4.9
)
 
(6.1
)
 
(4.2
)