Debt and Other Obligations (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt is comprised of the following:

	As of				Three Months Ended September 30,				Nine Months Ended September 30,
	September 30, 2018		December 31, 2017		2018		2017		2018		2017
	(in millions)				(weighted-average interest rates)
Fixed-rate senior term loans due through 2027	$	391.4	$	417.9	4.10	%	4.10	%	4.10	%	4.10	%
Fixed-rate junior term loans due through 2022	33.2		39.3		6.90	%	6.90	%	6.90	%	6.90	%
Fixed-rate loans due through 2029	493.9		518.0		3.83	%	3.76	%	3.83	%	3.76	%
Fixed-rate class A 2015-1 EETC due through 2028	393.6		408.6		4.10	%	4.10	%	4.10	%	4.10	%
Fixed-rate class B 2015-1 EETC due through 2024	84.0		92.0		4.45	%	4.45	%	4.45	%	4.45	%
Fixed-rate class C 2015-1 EETC due through 2023	115.2		—		4.93	%	N/A		4.93	%	N/A
Fixed-rate class AA 2017-1 EETC due through 2030	223.3		37.5		3.38	%	N/A		3.38	%	N/A
Fixed-rate class A 2017-1 EETC due through 2030	74.4		12.5		3.65	%	N/A		3.65	%	N/A
Fixed-rate class B 2017-1 EETC due through 2026	76.7		13.8		3.80	%	N/A		3.80	%	N/A
Fixed-rate class C 2017-1 EETC due through 2023	78.9		—		5.11	%	N/A		5.11	%	N/A
Long-term debt	1,964.6		1,539.6
Less current maturities	150.2		115.4
Less unamortized discounts	43.9		36.7
Total	$	1,770.5	$	1,387.5

Schedule of Maturities of Long-term Debt

At September 30, 2018, long-term debt principal payments for the next five years and thereafter are as follows:

	September 30, 2018
	(in millions)
remainder of 2018	$	44.0
2019	158.3
2020	155.3
2021	151.0
2022	147.9
2023 and beyond	1,308.1
Total debt principal payments	$	1,964.6

Schedule of Interest Expense, Long-term Debt

Interest expense related to long-term debt consisted of the following:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(in thousands)
Senior term loans	$	4,195	$	4,564	$	12,769	$	13,854
Junior term loans	605		746		1,908		2,323
Fixed-rate loans	4,844		2,811		14,636		4,555
Class A 2015-1 EETC	4,057		4,366		12,214		12,995
Class B 2015-1 EETC	939		1,118		2,881		3,410
Class C 2015-1 EETC	1,420		—		2,209		—
Class AA 2017-1 EETC	1,751		—		4,008		—
Class A 2017-1 EETC	631		—		1,445		—
Class B 2017-1 EETC	700		—		1,636		—
Class C 2017-1 EETC	934		—		1,400		—
Commitment fees	50		29		153		87
Amortization of debt discounts	1,784		1,362		4,930		3,883
Total	$	21,910	$	14,996	$	60,189	$	41,107