Commitments and Contingencies - Schedule of Future Aircraft Operating Leases (Details)	Mar. 31, 2017 aircraft
Long-term Purchase Commitment [Line Items]
remainder of 2017	14
2018	10
2019	15
2020	16
2021	18
Total future aircraft to be received	73
Airbus [Member] | A320 [Member]
Long-term Purchase Commitment [Line Items]
remainder of 2017	6
2018	5
2019	1
Total future aircraft to be received	12
Airbus [Member] | A320NEO [Member]
Long-term Purchase Commitment [Line Items]
2019	14
2020	16
2021	18
Total future aircraft to be received	48
Airbus [Member] | A321 [Member]
Long-term Purchase Commitment [Line Items]
remainder of 2017	8
2018	5
Total future aircraft to be received	13