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FLEET TRANSITION EXPENSES FLEET TRANSITION EXPENSES (Tables)
9 Months Ended
Sep. 30, 2012
Fleet Transition Expenses [Abstract]  
Schedule of Restructuring and Related Costs [Table Text Block]
Fleet transition expenses included in the consolidated statements of operations (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
Horizon Fleet Transition - CRJ-700
$

 
$
(2.6
)
 
$

 
$
28.3

Horizon Fleet Transition - Q200

 
4.6

 

 
10.6

Total
$

 
$
2.0

 
$

 
$
38.9