Summary of Financial Statement Preperation and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 airlines	Sep. 30, 2011	Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Number of independent cerificated airlines (in airlines)			3
Capitalized interest	$ 0.7	$ 0.6	$ 2.0	$ 1.5
Other liabilities for self-insured reserves	$ 31.3		$ 31.3		$ 31.2
Minimum [Member] | Support equipment [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Minimum [Member] | Vehicles and other equipment [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Maximum [Member] | Support equipment [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Maximum [Member] | Vehicles and other equipment [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	8 years
Boeing 727 and DC-8 [Member] | Aircraft and Flight Equipment [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	1 year
Boeing 767 and 757 [Member] | Minimum [Member] | Aircraft and Flight Equipment [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Boeing 767 and 757 [Member] | Maximum [Member] | Aircraft and Flight Equipment [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years