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Summary of Significant Accounting Policies - Estimated Useful Lives and Residual Values (Details)	12 Months Ended
	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

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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.

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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

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