Revenue Recognition - Narrative (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) segment line_of_business	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Number of lines of business \| line_of_business	1
Number of segments \| segment	1
Operating revenue	$ 559,144	$ 656,751
Revenue, performance obligation, timing	represents revenue that is expected to be realized over the next 12 months
Passenger revenue, excluding frequent flyer
Disaggregation of Revenue [Line Items]
Operating revenue	$ 474,135	567,855
Air traffic liability	429,200		$ 425,100
Air traffic revenue recognized	240,200	296,900
Frequent flyer revenue, transportation component
Disaggregation of Revenue [Line Items]
Operating revenue	29,334	$ 33,449
Air traffic liability	$ 359,700		$ 349,800
North America [Member] \| Geographic Concentration Risk \| Domestic Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	54.00%	52.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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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.

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