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Revenue Recognition Passenger Revenue (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Revenue Recognition [Abstract] |  |  |  |  |
Contract with Customer, Liability, Forward Bookings |  | 69.80% |  |  |
Contract with Customer, Liability, Credit Voucher Bookings |  | 30.20% |  |  |
Revenue, Performance Obligation, Description of Timing |  | 12 months |  |  |
Credit Voucher Term Expiration | 2 years |  |  |  |
Air Traffic Liability, Recognized |  | $ 177,800 |  |  |
Contract with Customer, Liability |  | $ 32,375 | $ 21,841 | $ 21,121 | $ 15,613
Air Traffic Liability, Current |  |  | $ 307,500 |  |

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- Definition Air Traffic Liability, Recognized + References No definition available. + Details
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- Definition Contract with Customer, Liability, Credit Voucher Bookings + References No definition available. + Details
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- Definition Contract with Customer, Liability, Forward Bookings + References No definition available. + Details
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- Definition The value of air transportation services sold but as yet unused by the passenger, including sales for air transportation to be provided by the reporting air carrier and air transportation to be provided by another air carrier for whom sales were made. Used to reflect the current portion of the liability (within one year or within the normal operating cycle if longer). + References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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- Definition Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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