FLEET TRANSITION	6 Months Ended
FLEET TRANSITION	Jun. 30, 2011
Restructuring and Related Activities [Abstract]
Fleet Transition	FLEET TRANSITION Horizon Fleet Transition to All-Q400 Fleet Horizon's long-term goal has been to transition to an all-Q400 fleet. During the first six months of 2011, the Company removed the final 13 CRJ-700 aircraft from its fleet through sublease to a third-party carrier. The total charge associated with removing these aircraft from operations was $30.9 million for the six months ended June 30, 2011. During the first six months of 2010, the Company recorded a charge of $3.4 million related to the removal of a CRJ-700 aircraft through a sublease. The charges represent the discounted expected cash flows from the sublease arrangement and the expected maintenance costs that management expects to pay for Horizon's share of the first maintenance event for each aircraft. Horizon has 16 Q200 aircraft that are subleased to a third-party carrier, for which an accrual related to the estimated sublease loss has been recorded in previous periods. The Company evaluated the associated liability in the second quarter of 2011 and determined that the ultimate loss associated with these aircraft will likely be higher than the original estimate. As such, the Company recorded an additional $6 million in the first six months of 2011 associated with these aircraft.

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

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