Summary Of Accounting Policies (Schedule Of Depreciable Lives Used For Principal Depreciable Asset Classifications) (Details)	12 Months Ended
	Dec. 31, 2011 years
American Jet Aircraft And Engines [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life - Minimum (in years)	20
Other Regional Aircraft And Engines [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life - Minimum (in years)	16
Depreciable Life - Maximum (in years)	20
Buildings And Improvements (Principally On Leased Land) [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life - Minimum (in years)	5
Depreciable Life - Maximum (in years)	30
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life - Minimum (in years)	5
Depreciable Life - Maximum (in years)	10