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Summary of Significant Accounting Policies - Estimated Useful Lives and Residual Values (Details) | 12 Months Ended
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Dec. 31, 2020
Aircraft |
Property, Plant and Equipment [Line Items] |
Estimated Useful Life | 25 years
Residual Value | 20.00%
Inflight entertainment systems |
Property, Plant and Equipment [Line Items] |
Residual Value | 0.00%
Aircraft parts |
Property, Plant and Equipment [Line Items] |
Residual Value | 10.00%
Flight equipment leasehold improvements |
Property, Plant and Equipment [Line Items] |
Residual Value | 0.00%
Ground property and equipment |
Property, Plant and Equipment [Line Items] |
Residual Value | 0.00%
Leasehold improvements—other |
Property, Plant and Equipment [Line Items] |
Residual Value | 0.00%
Buildings on leased land |
Property, Plant and Equipment [Line Items] |
Residual Value | 0.00%
Minimum | Inflight entertainment systems |
Property, Plant and Equipment [Line Items] |
Estimated Useful Life | 5 years
Minimum | Ground property and equipment |
Property, Plant and Equipment [Line Items] |
Estimated Useful Life | 2 years
Maximum | Inflight entertainment systems |
Property, Plant and Equipment [Line Items] |
Estimated Useful Life | 10 years
Maximum | Ground property and equipment |
Property, Plant and Equipment [Line Items] |
Estimated Useful Life | 10 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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