Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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Anticipated Jet Fuel Consumption Protected By Hedges, Percentage

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Anticipated Jet Fuel Consumption Protected By Hedges (Volume)

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- Definition

Federal Excise Tax

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- Definition

Future Aircraft To Be Received, Next Twelve Months

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Interest Expense, Past-due Fuel Excise Tax Payment

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Number of Aircraft Protected by Interest Rate Derivatives Scheduled for Delivery

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Payments for Premiums on Fuel Option Derivatives

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(a),(d))

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The cost for fuel, incurred during the period, before considering the impacts of any related hedging activities.

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(h))

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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-Publisher FASB

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-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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Number of interest rate derivative instruments held by the entity at the reporting date.

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

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-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (d)

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-Section 45

-Paragraph 12

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Financial Instruments and Risk Management (Details) (USD $)	8 Months Ended	12 Months Ended			54 Months Ended	66 Months Ended
	Aug. 31, 2014	Dec. 31, 2014 aircraft gal	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2014 aircraft gal	Oct. 23, 2014 derivative_instrument
Derivative [Line Items]
Payments for premiums to acquire fuel options		$ 9,700,000
Into-plane fuel cost		608,033,000us-gaap_FuelCostsGrossOfHedging	542,523,000us-gaap_FuelCostsGrossOfHedging	471,542,000us-gaap_FuelCostsGrossOfHedging
Realized losses (gains)		995,000us-gaap_GainLossOnSaleOfDerivatives	8,958,000us-gaap_GainLossOnSaleOfDerivatives	175,000us-gaap_GainLossOnSaleOfDerivatives
Unrealized mark-to-market losses (gains)		3,881,000us-gaap_UnrealizedGainLossOnDerivatives	265,000us-gaap_UnrealizedGainLossOnDerivatives	46,000us-gaap_UnrealizedGainLossOnDerivatives
Aircraft fuel		612,909,000us-gaap_FuelCosts	551,746,000us-gaap_FuelCosts	471,763,000us-gaap_FuelCosts
Underpayment of fuel, federal excise tax	2,100,000save_FederalExciseTax				9,300,000save_FederalExciseTax
Interest expense, past-due tax payments						800,000
Jet fuel consumption protected, fuel derivative (gallons)		88,700,000				88,700,000
Anticipated jet fuel consumption protected by hedges (percent)		35.00%				35.00%
Future aircraft to be received, next twelve months		15				15
Derivative instrument, change in fair value recorded within accumulated other comprehensive income, deferred tax		423,000	0	0
Interest rate swap
Derivative [Line Items]
Number of forward interest rate swaps							6
Derivative, notional amount							120,000,000
Interest rate swap, liability		1,100,000				1,100,000
Interest rate swap \| Cash flow hedge
Derivative [Line Items]
Derivative instrument, change in fair value recorded within accumulated other comprehensive income		700,000
Derivative instrument, change in fair value recorded within accumulated other comprehensive income, deferred tax		$ 400,000
Airbus A321
Derivative [Line Items]
Number of aircraft protected by interest rate derivatives scheduled for delivery							3
Options held \| Fuel
Derivative [Line Items]
Derivative, weighted-average ceiling price		2.07				2.07