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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - LEASED AIRCRAFT RETURN COSTS (DETAILS) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Leased aircraft return costs $ 1alk_LeasedAircraftReturnCosts $ 15alk_LeasedAircraftReturnCosts