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Debt and Other Obligations (Tables)
 3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt is comprised of the following:
As ofAs of
March 31, 2024December 31, 2023March 31, 2024December 31, 2023
(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)
1,055.8 1,093.3 6.44 %5.83 %
Unsecured term loans due in 2031136.3 136.3 1.00 %1.00 %
Fixed-rate class A 2015-1 EETC due through 2028256.6 256.6 4.10 %4.10 %
Fixed-rate class B 2015-1 EETC due through 202440.0 40.0 4.45 %4.45 %
Fixed-rate class AA 2017-1 EETC due through 2030
166.2 172.2 3.38 %3.38 %
Fixed-rate class A 2017-1 EETC due through 2030
55.4 57.4 3.65 %3.65 %
Fixed-rate class B 2017-1 EETC due through 2026
46.4 48.2 3.80 %3.80 %
Convertible notes due 202525.1 25.1 4.75 %4.75 %
Convertible notes due 2026500.0 500.0 1.00 %1.00 %
Long-term debt$3,391.8 $3,439.1 
Less current maturities156.6 315.3 
Less unamortized discounts, net
60.2 69.0 
Total$3,175.0 $3,054.8 
(1) Includes obligations related to 18 aircraft recorded as a failed sale leaseback. Refer to Note 10, Leases for additional information.
Schedule of Maturities of Long-term Debt
At March 31, 2024, long-term debt principal payments for the next five years and thereafter were as follows:

March 31, 2024
(in millions)
Remainder of 2024$138.1 
20251,267.5 
2026674.1 
2027154.7 
2028257.2 
2029 and beyond900.2 
Total debt principal payments$3,391.8 
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,
20242023
(in thousands)
8.00% senior secured notes (1)
$23,252 $23,252 
Fixed-rate term loans17,852 9,563 
Unsecured term loans339 336 
Class A 2015-1 EETC2,612 2,824 
Class B 2015-1 EETC442 528 
Class C 2015-1 EETC— 777 
Class AA 2017-1 EETC1,420 1,521 
Class A 2017-1 EETC510 548 
Class B 2017-1 EETC445 476 
Class C 2017-1 EETC— 522 
Convertible notes (2)
3,932 7,045 
Finance leases8 8 
Commitment and other fees415 417 
Amortization of deferred financing costs3,582 3,976 
Total$54,809 $51,793 
(1) Includes $1.1 million of accretion and $22.2 million of interest expense for the three months ended March 31, 2024. Includes $1.1 million of accretion and $22.2 million of interest expense for the three months ended March 31, 2023.
(2) Includes $4.4 million of amortization of the discount for the convertible notes due 2026 as well as interest expense for the convertible notes due 2025 and 2026, offset by $0.5 million of favorable mark to market adjustments for the convertible notes due 2026 for the three months ended March 31, 2024. Includes $5.4 million of amortization of the discount for the convertible notes due 2026, as well as 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.