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Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details) - Dec. 31, 2019	commitment	aircraft
Airbus A321XLR
Long-term Purchase Commitment [Line Items]
Number of firm commitments | commitment	50
Scheduled aircraft deliveries in 2020		0
Scheduled aircraft deliveries after 2020		50
Airbus A350
Long-term Purchase Commitment [Line Items]
Number of firm commitments | commitment	45
Scheduled aircraft deliveries in 2020		0
Scheduled aircraft deliveries after 2020		45
Boeing 737 MAX
Long-term Purchase Commitment [Line Items]
Number of firm commitments | commitment	171
Scheduled aircraft deliveries in 2020		44
Scheduled aircraft deliveries after 2020		127
Boeing 777-300ER
Long-term Purchase Commitment [Line Items]
Number of firm commitments | commitment	2
Scheduled aircraft deliveries in 2020		2
Scheduled aircraft deliveries after 2020		0
Boeing 787
Long-term Purchase Commitment [Line Items]
Number of firm commitments | commitment	16
Scheduled aircraft deliveries in 2020		15
Scheduled aircraft deliveries after 2020		1
Embraer E175
Long-term Purchase Commitment [Line Items]
Number of firm commitments	20	20
Scheduled aircraft deliveries in 2020		20
Scheduled aircraft deliveries after 2020		0

X

- Definition

Number Of Aircraft Expected To Take Delivery, Next Twelve Months

+ References

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X

- Definition

Number Of Aircrafts Expected To Take Delivery, Thereafter

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X

- 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.

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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.

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