Commitment and Contingencies - Long Term Purchase Commitments (Details) - aircraft	Jun. 30, 2021	Dec. 31, 2020
Long-term Purchase Commitment [Line Items]
2021	28
2022	114
2023	90
2024	86
2025	86
2026	70
2027	36
2028	30
2029	50
2030	60
2031	10
Total	660
MAX 7 Firm Orders
Long-term Purchase Commitment [Line Items]
2021	0
2022	64
2023	30
2024	30
2025	30
2026	15
2027	15
2028	15
2029	20
2030	15
2031	0
Total	234
MAX 8 Firm Orders
Long-term Purchase Commitment [Line Items]
2021	19
2022	0
2023	0
2024	0
2025	0
2026	15
2027	15
2028	15
2029	30
2030	45
2031	10
Total	149
Owned aircrafts delivered	19
Leased aircrafts delivered	8	7
MAX 8 Firm Orders | Other Commitment, Aircraft Deliveries In 2020
Long-term Purchase Commitment [Line Items]
Aircrafts delivered	27
MAX 8 Firm Orders | Other Commitment, Aircraft Deliveries In 2020 and 2021
Long-term Purchase Commitment [Line Items]
Leased aircrafts delivered	16
MAX 7 or 8 Options
Long-term Purchase Commitment [Line Items]
2021	0
2022	50
2023	60
2024	56
2025	56
2026	40
2027	6
2028	0
2029	0
2030	0
2031	0
Total	268
Additional MAX 8s
Long-term Purchase Commitment [Line Items]
2021	9
2022	0
2023	0
2024	0
2025	0
2026	0
2027	0
2028	0
2029	0
2030	0
2031	0
Total	9