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Aircraft and Other Equipment
12 Months Ended
Dec. 31, 2014
AIRCRAFT AND OTHER EQUIPMENT [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
AIRCRAFT AND OTHER EQUIPMENT

Aircraft and other equipment, excluding other equipment held for sale, consist of the following as of December 31 (in millions): 
 
2014
 
2013
Aircraft
$
3,644.8

 
$
3,221.8

Flight equipment
171.7

 
173.8

Office equipment and leasehold improvements
44.4

 
44.8

Total aircraft and other equipment    
3,860.9

 
3,440.4

Less accumulated depreciation and amortization
(1,000.0
)
 
(876.8
)
Aircraft and other equipment—net
$
2,860.9

 
$
2,563.6



Aircraft and other equipment depreciation and amortization expense for the years ended December 31, 2014, 2013 and 2012 was $173.0 million, $150.7 million, and $160.0 million, respectively. In December 2014, March 2014 and September 2013, we recorded $27.7 million, $19.9 million and $12.0 million in impairment charges, respectively, as discussed in Note 3. The Company also recorded a $5.8 million loss on the sale of two E190 aircraft that was recorded in impairment charges and other.