Aircraft Maintenance Deposits

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- Definition

Aircraft Maintenance Deposits, Current

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- Definition

Operating Lease, Period before Renewal or Extension

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- Definition

Operating Leases of Lessee, Number of Assets Leased, Affected by Variable Rate Basis

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- Definition

Operating Leases of Lessee, Number of Leased Assets

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- Definition

Operating Leases of Lessee, Number of Leases Available for Renewal

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- Definition

Operating Leases, Rent Expense, Supplemental, Maintenance Reserves

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- Definition

Expenses incurred related to the lease of aircraft from outside third parties that are used in the entity's business operations.

+ References

No definition available.

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- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Rentals

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 50

-Paragraph 2

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-Topic 840

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Leases and Prepaid Maintenance Deposits - Operating Leases (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Total rental expense	$ 254,300,000us-gaap_OperatingLeasesRentExpenseNet	$ 214,600,000us-gaap_OperatingLeasesRentExpenseNet	$ 178,400,000us-gaap_OperatingLeasesRentExpenseNet
Rental expense charged to operations for aircraft and engine operating leases	195,827,000us-gaap_AircraftRental	169,737,000us-gaap_AircraftRental	143,572,000us-gaap_AircraftRental
Aircraft maintenance deposits	250,000,000save_AircraftMaintenanceDeposits	220,700,000save_AircraftMaintenanceDeposits
Maintenance reserves, supplemental rent	1,600,000	1,900,000	2,000,000
Prepaid Expenses and Other Current Assets
Operating Leased Assets [Line Items]
Prepaid aircraft maintenance to lessors, current	36,900,000	59,200,000
Fixed Maintenance Reserve Payments \| Aircraft and Related Flight Equipment
Operating Leased Assets [Line Items]
Committed expenditures, 2015	7,600,000
Committed expenditures, 2016	8,000,000
Committed expenditures, 2017	7,400,000
Committed expenditures, 2018	5,800,000
Committed expenditures, 2019	4,200,000
Committed expenditures, 2020 and beyond	14,100,000
Aircraft rent
Operating Leased Assets [Line Items]
Supplemental rent expense	$ 7,500,000	$ 5,200,000	$ 2,000,000
Aircraft
Operating Leased Assets [Line Items]
Number of aircraft and spare engines financed under operating leases	61
Number of aircraft and spare engines financed under operating leases with a variable rate	5
Number of aircraft leases available for renewal	3
Aircraft operating leases, renewal term	3 years
Aircraft operating leases, period before renewal	10 years
Aircraft \| Minimum
Operating Leased Assets [Line Items]
Operating leases, term	3 years
Aircraft \| Maximum
Operating Leased Assets [Line Items]
Operating leases, term	15 years
Other leased equipment and property \| Maximum
Operating Leased Assets [Line Items]
Operating leases, term	25 years
Spare engines
Operating Leased Assets [Line Items]
Number of aircraft and spare engines financed under operating leases	10
Spare engines \| Minimum
Operating Leased Assets [Line Items]
Operating leases, term	7 years
Spare engines \| Maximum
Operating Leased Assets [Line Items]
Operating leases, term	12 years