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Commitments and Contingencies - Aircraft and Engine Orders (Details)
1 Months Ended 12 Months Ended
Nov. 30, 2021
aircraft
Jul. 31, 2021
aircraft
Dec. 31, 2017
aircraft
Dec. 31, 2021
aircraft
aircraftEngine
Air Transportation Equipment        
Long-term Purchase Commitment [Line Items]        
2022       14
2023       21
2024       24
2025       30
2026       41
Thereafter       104
Total       234
Aircraft Engine        
Long-term Purchase Commitment [Line Items]        
2022 | aircraftEngine       5
2023 | aircraftEngine       2
2024 | aircraftEngine       2
2025 | aircraftEngine       3
2026 | aircraftEngine       3
Thereafter | aircraftEngine       6
Total | aircraftEngine       21
A320neo | Air Transportation Equipment        
Long-term Purchase Commitment [Line Items]        
2022       9
2023       0
2024       0
2025       17
2026       19
Thereafter       31
Total     67 76
A321neo | Air Transportation Equipment        
Long-term Purchase Commitment [Line Items]        
2022       5
2023       21
2024       24
2025       13
2026       22
Thereafter       73
Total 91 10 67 158