Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	0 Months Ended
Jun. 30, 2013 aircraft	May 21, 2013 E175 Embraer S. A agreement aircraft
Commitments and Contingencies
Number of aircraft to be purchased		100
Number of aircraft delivered		40
Number of aircraft to be acquired on condition		60
Number of aircraft leased by the entity	575
Future minimum rental payments required under operating leases
July through December 2013	$ 174,682
2014	378,877
2015	325,540
2016	254,928
2017	192,602
Thereafter	720,718
Total	2,047,347
Commitments for the acquisition of aircraft and related spare engines
2014	569,640
2015	591,368
2016	9,972
Total	$ 1,170,980

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Represents the number of aircraft delivered under the agreement.

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Represents the number of aircrafts purchased under the agreement.

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Represents the number of aircrafts considered conditional deliveries under the agreement.

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Represents the number of aircrafts leased by the entity during the period.

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No definition available.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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-Name Statement of Financial Accounting Standard (FAS)

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the remainder of the fiscal year following the latest fiscal year ended for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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