This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

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+ Details

Investments in Other Company (Details) (Air Mekong, USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2010	Mar. 31, 2013	Dec. 31, 2011	Dec. 31, 2012	Aug. 31, 2010 CRJ 900 aircraft
Investment in Other Company
Payments to acquire equity method investment	$ 7		$ 3
Percentage ownership acquired	30.00%
Company's investment balance		1.7
Voting ownership interest (as a percent)				17.00%
Number of aircraft subleased					4
Other income recognized on termination of sub-lease with Air Mekong		$ 5.1