Commitments and Contingencies (Details) (USD $)	3 Months Ended
Mar. 31, 2015 aircraft	Dec. 31, 2014
Commitments and Contingencies
Number of aircraft leased by the entity	534
Future minimum rental payments required under operating leases
April through December 2015	$ 199,108,000
2016	270,706,000
2017	201,467,000
2018	156,437,000
2019	119,618,000
Thereafter	453,545,000
Total future lease obligations	1,400,881,000
E175
Supply Commitment [Line Items]
Number of aircraft delivered	9
Interim debt amount	203,100,000
Debt Instrument, Term	12 years
E175 \| Minimum
Supply Commitment [Line Items]
Interest rate (as a percent)	3.50%
E175 \| Maximum
Supply Commitment [Line Items]
Interest rate (as a percent)	3.70%
EMB 120
Future minimum rental payments required under operating leases
Total future lease obligations	$ 2,900,000	$ 3,800,000

Represents the number of aircraft delivered under the agreement.

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

+ References

No definition available.

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

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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 in the third 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 second 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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No definition available.

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