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Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details) | Sep. 30, 2019 commitment Aircraft
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Scheduled Aircraft Deliveries |
2020 | Aircraft | 17
Airbus A350 |
Long-term Purchase Commitment [Line Items] |
Number of firm commitments | 45
Scheduled Aircraft Deliveries |
Last Three 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 Three 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 Three 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 Three Months of 2019 | 2
2020 | 15
After 2020 | 1
Embraer E175 |
Long-term Purchase Commitment [Line Items] |
Number of firm commitments | 29
Scheduled Aircraft Deliveries |
Last Three Months of 2019 | 9
2020 | 20
After 2020 | 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes. + References No definition available. + Details
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