Commitments and Contingencies - Aircraft Purchase Commitments Narrative (Details) - Future aircraft purchase commitments	12 Months Ended
Dec. 31, 2017 aircraft
A321-200
Unrecorded Unconditional Purchase Obligation
Expanded agreement for additional aircraft	45
A350-900
Unrecorded Unconditional Purchase Obligation
Number of aircraft with deferred delivery	10
A321-200neo
Unrecorded Unconditional Purchase Obligation
Expanded agreement for additional aircraft	100
Option agreement for future purchase of additional aircraft	100
Minimum \| A350-900
Unrecorded Unconditional Purchase Obligation
Period of deferment	2 years
Maximum \| A350-900
Unrecorded Unconditional Purchase Obligation
Period of deferment	3 years

Unrecorded Unconditional Purchase Obligation, Future Option, Quantity Increase Decrease

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- Definition

Unrecorded Unconditional Purchase Obligation, Period Of Deferment

+ References

No definition available.

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- Definition

Unrecorded Unconditional Purchase Obligation, Period Quantity Deferred

+ References

No definition available.

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- Definition

Unrecorded Unconditional Purchase Obligation, Period Quantity Increase Decrease

+ References

No definition available.

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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.

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