Nature of Operations and Summary of Significant Accounting Policies (Details 4) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Sep. 30, 2005 Atlantic Southeast Airlines,Inc. Y	Dec. 31, 2011 Atlantic Southeast Airlines,Inc.	Dec. 31, 2010 Atlantic Southeast Airlines,Inc.	Sep. 07, 2005 Atlantic Southeast Airlines,Inc.
Impairment of Long Lived and Intangible Assets
Property and equipment and related assets	$ 2,883,475,000	$ 2,942,819,000
Intangible assets	19,497,000	21,747,000	23,997,000
Intangible assets related to acquisition of Atlantic Southeast							33,700,000
Period for amortization of intangible assets (in years)				15
Accumulated amortization expense					14,300,000	12,000,000
Capitalized Interest
Capitalized interest costs	$ 0	$ 5,000	$ 843,000