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Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)
Jun. 30, 2019
commitment
Aircraft
Scheduled Aircraft Deliveries  
2020 | Aircraft 17
Airbus A350  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 45
Scheduled Aircraft Deliveries  
Last Six Months of 2019 0
2020 0
After 2020 45
Boeing 737 MAX  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 171
Scheduled Aircraft Deliveries  
Last Six Months of 2019 16
2020 28
After 2020 127
Boeing 777-300ER  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 4
Scheduled Aircraft Deliveries  
Last Six Months of 2019 2
2020 2
After 2020 0
Boeing 787  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 18
Scheduled Aircraft Deliveries  
Last Six Months of 2019 2
2020 15
After 2020 1
Embraer E175  
Long-term Purchase Commitment [Line Items]  
Number of firm commitments 38
Scheduled Aircraft Deliveries  
Last Six Months of 2019 18
2020 20
After 2020 0