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Debt and Other Obligations (Tables)
 3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt is comprised of the following:

As ofAs of
March 31, 2023December 31, 2022March 31, 2023December 31, 2022
(in millions)(weighted-average interest rates)
8.00% senior secured notes due 2025
$1,110.0 $1,110.0 8.00 %8.00 %
Fixed-rate loans due through 2039 (1)
1,061.9 1,094.7 3.52 %3.52 %
Unsecured term loans due in 2031136.3 136.3 1.00 %1.00 %
Fixed-rate class A 2015-1 EETC due through 2028278.6 278.6 4.10 %4.10 %
Fixed-rate class B 2015-1 EETC due through 202448.0 48.0 4.45 %4.45 %
Fixed-rate class C 2015-1 EETC due through 202363.8 63.8 4.93 %4.93 %
Fixed-rate class AA 2017-1 EETC due through 2030
179.2 186.3 3.38 %3.38 %
Fixed-rate class A 2017-1 EETC due through 2030
59.7 62.1 3.65 %3.65 %
Fixed-rate class B 2017-1 EETC due through 2026
49.9 51.7 3.80 %3.80 %
Fixed-rate class C 2017-1 EETC due through 2023
— 85.5 5.11 %5.11 %
Convertible notes due 202525.1 25.4 4.75 %4.75 %
Convertible notes due 2026500.0 500.0 1.00 %1.00 %
Long-term debt$3,512.5 $3,642.4 
Less current maturities261.4 346.4 
Less unamortized discounts, net
87.5 95.8 
Total$3,163.6 $3,200.2 
(1) Includes obligations related to one aircraft recorded as a failed sale leaseback. Refer to Note 9, Leases for additional information.
Schedule of Maturities of Long-term Debt
At March 31, 2023, long-term debt principal payments for the next five years and thereafter were as follows:

March 31, 2023
(in millions)
Remainder of 2023$207.2 
2024222.1 
20251,323.5 
2026731.1 
2027197.3 
2028 and beyond831.3 
Total debt principal payments$3,512.5 
Schedule of Interest Expense, Long-term Debt
Interest expense related to long-term debt and finance leases consists of the following:
 Three Months Ended March 31,
20232022
(in thousands)
8.00% senior secured notes (1)
$23,252 $10,461 
Fixed-rate term loans9,563 10,684 
Unsecured term loans336 336 
Class A 2015-1 EETC2,824 3,048 
Class B 2015-1 EETC528 616 
Class C 2015-1 EETC777 917 
Class AA 2017-1 EETC1,521 1,638 
Class A 2017-1 EETC548 590 
Class B 2017-1 EETC476 512 
Class C 2017-1 EETC522 1,080 
Convertible notes (2)
7,045 3,223 
Finance leases8 18 
Commitment and other fees417 535 
Amortization of deferred financing costs3,976 4,222 
Total$51,793 $37,880 
(1) Includes $1.1 million of accretion and $22.2 million of interest expense for the three months ended March 31, 2023. Includes $0.3 million of accretion and $10.2 million of interest expense for the three months ended March 31, 2022.
(2) Includes $3.8 million of amortization of the discount for the convertible notes due 2026, $1.6 million of interest expense for the convertible notes due 2025 and 2026 and $1.7 million of unfavorable mark to market adjustments for the convertible notes due 2026 for the three months ended March 31, 2023. Includes $2.5 million of amortization of the discount for the convertible notes due 2026, $1.6 million of interest expense for the convertible notes due 2025 and 2026 offset by $0.9 million of favorable mark to market adjustments for the convertible notes due 2026 for the three months ended March 31, 2022.