Debt and Other Obligations (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt is comprised of the following:

	As of				Three Months Ended March 31,
	March 31, 2018		December 31, 2017		2018		2017
	(in millions)				(weighted-average interest rates)
Fixed-rate senior term loans due through 2027	$	409.1	$	417.9	4.10	%	4.10	%
Fixed-rate junior term loans due through 2022	37.3		39.3		6.90	%	6.90	%
Fixed-rate loans due through 2029	510.1		518.0		3.83	%	3.88	%
Fixed-rate class A 2015-1 EETC due through 2028	408.6		408.6		4.10	%	4.10	%
Fixed-rate class B 2015-1 EETC due through 2024	92.0		92.0		4.45	%	4.45	%
Fixed-rate class AA 2017-1 EETC due through 2030	171.0		37.5		3.38	%	N/A
Fixed-rate class A 2017-1 EETC due through 2030	57.0		12.5		3.65	%	N/A
Fixed-rate class B 2017-1 EETC due through 2026	63.0		13.8		3.80	%	N/A
Long-term debt	1,748.1		1,539.6
Less current maturities	136.5		115.4
Less unamortized discounts	40.7		36.7
Total	$	1,570.9	$	1,387.5

Schedule of Maturities of Long-term Debt

At March 31, 2018, long-term debt principal payments for the next five years and thereafter are as follows:

	March 31, 2018
	(in millions)
2018	$	112.9
2019	138.2
2020	135.9
2021	133.6
2022	130.6
2023 and beyond	1,096.9
Total debt principal payments	$	1,748.1

Schedule of Interest Expense, Long-term Debt

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

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Senior term loans	$	4,317	$	4,672
Junior term loans	667		803
Fixed-rate loans	4,911		159
Class A 2015-1 EETC	4,142		4,308
Class B 2015-1 EETC	1,012		1,185
Class AA 2017-1 EETC	682		—
Class A 2017-1 EETC	246		—
Class B 2017-1 EETC	283		—
Commitment fees	52		30
Amortization of debt discounts	1,491		1,231
Total	$	17,803	$	12,388