Commitments and Contingencies - Schedule of Future Aircraft Operating Leases (Details)	Mar. 31, 2018 aircraft
Long-term Purchase Commitment [Line Items]
remainder of 2018	8
2019	11
2020	16
2021	18
Total future aircraft to be received	53
Airbus [Member] | A320 [Member]
Long-term Purchase Commitment [Line Items]
remainder of 2018	8
2019	2
2020
Total future aircraft to be received	10
Airbus [Member] | A320NEO [Member]
Long-term Purchase Commitment [Line Items]
2019	9
2020	16
2021	18
Total future aircraft to be received	43