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Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)
Mar. 31, 2020
commitment
Airbus A321XLR  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 50
Scheduled Aircraft Deliveries  
Last Nine Months of 2020 0
2021 0
After 2021 50
Airbus A350  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 45
Scheduled Aircraft Deliveries  
Last Nine Months of 2020 0
2021 0
After 2021 45
Boeing 737 MAX  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 171
Scheduled Aircraft Deliveries  
Last Nine Months of 2020 (if order is lifted) 16
2021 (if order is lifted) 24
Boeing 787  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 19
Scheduled Aircraft Deliveries  
Last Nine Months of 2020 11
2021 8
After 2021 0
Embraer E175  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 20
Scheduled Aircraft Deliveries  
Last Nine Months of 2020 16
2021 4
After 2021 0