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Debt and Other Obligations (Tables)
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt is comprised of the following:

As ofAs of
June 30, 2023December 31, 2022June 30, 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)
1,028.3 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 2028267.6 278.6 4.10 %4.10 %
Fixed-rate class B 2015-1 EETC due through 202444.0 48.0 4.45 %4.45 %
Fixed-rate class C 2015-1 EETC due through 2023— 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$3,400.1 $3,642.4 
Less current maturities235.2 346.4 
Less unamortized discounts, net
84.2 95.8 
Total$3,080.7 $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 June 30, 2023, long-term debt principal payments for the next five years and thereafter were as follows:

June 30, 2023
(in millions)
Remainder of 2023$94.8 
2024222.1 
20251,323.5 
2026731.1 
2027197.3 
2028 and beyond831.3 
Total debt principal payments$3,400.1 
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,
2023202220232022
(in thousands)
8.00% senior secured notes (1)
$23,252 $10,461 46,505 $20,921 
Fixed-rate term loans9,339 10,485 18,901 21,169 
Unsecured term loans340 340 676 676 
Class A 2015-1 EETC2,730 2,954 5,554 6,001 
Class B 2015-1 EETC487 575 1,015 1,191 
Class C 2015-1 EETC— 856 777 1,773 
Class AA 2017-1 EETC1,521 1,640 3,042 3,278 
Class A 2017-1 EETC548 591 1,097 1,182 
Class B 2017-1 EETC477 510 953 1,022 
Class C 2017-1 EETC— 1,092 522 2,171 
Convertible notes (2)
(14,087)(3,024)(7,041)199 
Finance leases8 16 17 34 
Commitment and other fees412 418 827 955 
Amortization of deferred financing costs3,853 3,210 7,829 7,432 
Total$28,880 $30,124 $80,674 $68,004 
(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, 2023, respectively. Includes $0.3 million and $0.5 million of accretion and $10.2 million and $20.4 million of interest expense for the three and six months ended June 30, 2022, respectively.
(2) 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. Includes $5.4 million and $9.5 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 $8.4 million and $9.3 million of favorable mark to market adjustments for the convertible notes due 2026 for the three and six months ended June 30, 2022, respectively.