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Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)	Dec. 31, 2020 aircraftCommitment aircraft
Airbus A321XLR
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	50
Scheduled aircraft deliveries in 2021	0
Scheduled aircraft deliveries in 2022	0
Scheduled aircraft deliveries after 2022	50
Airbus A350
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	45
Scheduled aircraft deliveries in 2021	0
Scheduled aircraft deliveries in 2022	0
Scheduled aircraft deliveries after 2022	45
Boeing 737 MAX
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	188
Scheduled aircraft deliveries in 2021	21
Scheduled aircraft deliveries in 2022	40
Scheduled aircraft deliveries after 2022	127
Boeing 787
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	11
Scheduled aircraft deliveries in 2021	11
Scheduled aircraft deliveries in 2022	0
Scheduled aircraft deliveries after 2022	0
Embraer E175
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	4
Scheduled aircraft deliveries in 2021	4
Scheduled aircraft deliveries in 2022	0
Scheduled aircraft deliveries after 2022	0

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- Definition

Number Of Aircrafts Expected To Take Delivery, Thereafter

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- Definition

Number Of Aircrafts Expected To Take Delivery, Year One

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- Definition

Number Of Aircrafts Expected To Take Delivery, Year Two

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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.

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- Definition

The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

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