Nature of Operations and Summary of Significant Accounting Policies (Details 4) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 07, 2005 Atlantic Southeast Airlines,Inc.	Dec. 31, 2013 Atlantic Southeast Airlines,Inc.	Dec. 31, 2012 Atlantic Southeast Airlines,Inc.
Impairment of Long Lived and Intangible Assets
Property and equipment and related assets	$ 2,651,793,000	$ 2,710,996,000
Intangible assets	14,998,000	17,248,000	19,497,000
Intangible assets related to acquisition of Atlantic Southeast				33,700,000
Period for amortization of intangible assets				15 years
Accumulated amortization expense					18,700,000	16,500,000
Capitalized Interest
Capitalized interest costs	$ 1,200,000	$ 0	$ 0