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Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details) | Jun. 30, 2021 commitment | Jun. 27, 2021 aircraft
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Airbus A321XLR |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | 50 |
Scheduled Aircraft Deliveries |  |
Last Six Months of 2021 | 0 |
2022 | 0 |
2023 | 0 |
After 2022 | 50 |
Airbus A321neo |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | 70 | 70
Scheduled Aircraft Deliveries |  |
Last Six Months of 2021 | 0 |
2022 | 0 |
2023 | 16 |
After 2022 | 54 |
Airbus A350 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | 45 |
Scheduled Aircraft Deliveries |  |
Last Six Months of 2021 | 0 |
2022 | 0 |
2023 | 0 |
After 2022 | 45 |
Boeing 737 MAX |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | 380 |
Scheduled Aircraft Deliveries |  |
Last Six Months of 2021 | 13 |
2022 | 40 |
2023 | 122 |
After 2022 | 205 |
Boeing 787 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | 8 |
Scheduled Aircraft Deliveries |  |
Last Six Months of 2021 | 8 |
2022 | 0 |
2023 | 0 |
After 2022 | 0 |

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- Definition Number Of Aircrafts Expected To Take Delivery, Remainder Of Year + References No definition available. + Details
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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 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. + References No definition available. + Details
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