Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The future minimum lease payments of the Company as of December 31, 2018 are scheduled below (in thousands):

	Facility Leases		Aircraft and Other Leases
2019	$	10,898	$	6,607
2020	9,903		5,515
2021	8,348		4,355
2022	5,233		1,502
2023	3,140		1,501
2024 and beyond	10,461		2,001
Total minimum lease payments	$	47,983	$	21,481

Schedules of Concentration of Risk, by Risk Factor

As of December 31, 2018, the flight crewmember employees of ABX, ATI and Omni and flight attendant employees of ATI and Omni were represented by the labor unions listed below:

Airline	Labor Agreement Unit	Percentage of the Company’s Employees
ABX	International Brotherhood of Teamsters	6.5%
ATI	Air Line Pilots Association	6.7%
Omni	International Brotherhood of Teamsters	6.9%
ATI	Association of Flight Attendants	1.0%
Omni	Association of Flight Attendants	8.2%