Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)	Dec. 31, 2021 aircraftCommitment aircraft
Airbus A321XLR
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	50
Scheduled aircraft deliveries in 2022	0
Scheduled aircraft deliveries in 2023	0
Scheduled aircraft deliveries after 2023	50
Airbus A321neo
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	70
Scheduled aircraft deliveries in 2022	0
Scheduled aircraft deliveries in 2023	12
Scheduled aircraft deliveries after 2023	58
Airbus A350
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	45
Scheduled aircraft deliveries in 2022	0
Scheduled aircraft deliveries in 2023	0
Scheduled aircraft deliveries after 2023	45
Boeing 737 MAX
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	367
Scheduled aircraft deliveries in 2022	53
Scheduled aircraft deliveries in 2023	109
Scheduled aircraft deliveries after 2023	205
Boeing 787
Long-term Purchase Commitment [Line Items]
Number of firm commitments | aircraftCommitment	8
Scheduled aircraft deliveries in 2022	8
Scheduled aircraft deliveries in 2023	0
Scheduled aircraft deliveries after 2023	0