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Debt and Other Obligations (Tables)
 6 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt is comprised of the following:

As ofAs of
June 30, 2024December 31, 2023June 30, 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)
1,033.9 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 2028245.6 256.6 4.10 %4.10 %
Fixed-rate class B 2015-1 EETC due through 2024— 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$3,318.9 $3,439.1 
Less current maturities142.6 315.3 
Less unamortized discounts, net
52.7 69.0 
Total$3,123.6 $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 June 30, 2024, long-term debt principal payments for the next five years and thereafter were as follows:

June 30, 2024
(in millions)
Remainder of 2024$65.2 
20251,267.5 
2026674.1 
2027154.7 
2028257.2 
2029 and beyond900.2 
Total debt principal payments$3,318.9 
Schedule of Interest Expense, Long-term Debt
Interest expense related to long-term debt and finance leases consists of the following:
 Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
(in thousands)
8.00% senior secured notes (1)
$23,252 $23,252 46,505 $46,505 
Fixed-rate term loans17,503 9,339 35,355 18,901 
Unsecured term loans346 340 685 676 
Class A 2015-1 EETC2,505 2,730 5,117 5,554 
Class B 2015-1 EETC5 487 446 1,015 
Class C 2015-1 EETC— — — 777 
Class AA 2017-1 EETC1,403 1,521 2,823 3,042 
Class A 2017-1 EETC504 548 1,014 1,097 
Class B 2017-1 EETC440 477 885 953 
Class C 2017-1 EETC— — — 522 
Convertible notes (2)
4,432 (14,087)8,363 (7,041)
Finance leases9 8 17 17 
Commitment and other fees421 412 835 827 
Amortization of deferred financing costs3,487 3,853 7,069 7,829 
Total$54,307 $28,880 $109,114 $80,674 
(1) Includes $1.1 million and $2.1 million of accretion and $22.2 million and $44.4 million of interest expense for the three and six months ended June 30, 2024, respectively. Includes $1.1 million and $2.1 million of accretion and $22.2 million and $44.4 million of interest expense for the three and six months ended June 30, 2023, respectively.
(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, for the three months ended June 30, 2024. Includes $8.9 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, partially offset by $0.5 million of favorable mark to market adjustments for the convertible notes due 2026, for the six months ended June 30, 2024. Includes $0.1 million and $5.5 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 $14.2 million and $12.5 million of favorable mark to market adjustments for the convertible notes due 2026, for the three and six months ended June 30, 2023, respectively.