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Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Aggregate environmental-related accruals	$ 1.6	$ 1.5
beneficial ownership percentage	5
Term on alliance agreement (years)	3
Condition for termination of agreement	the agreement may be terminated by the Company if the payments to Southwest exceed $12 million in the second year of air service
Standby guarantee liability	0.8	0.8
Surety Bonds [Member]
Commitment obligations	28.7	27.9
Financial Stand By Letter Of Credit [Member]
Commitment obligations	$ 0.8	$ 0.8

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of contractual guarantees to which the Company is obligated as of the balance sheet date.

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