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Long-term Debt, Short-term Borrowings and Finance Lease Obligations (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Schedule of long term debt
Long-term debt and finance lease obligations and the related weighted average contractual interest rate at December 31, 2022 and 2021 consisted of the following (in millions):
 December 31, 2022December 31, 2021
Secured Debt
Fixed rate specialty bonds, due through 2036$43 4.9 %$43 4.9 %
Fixed rate enhanced equipment notes:
2019-1 Series AA, due through 2032510 2.8 %538 2.8 %
2019-1 Series A, due through 2028159 3.0 %168 3.0 %
2019-1 Series B, due through 202783 8.1 %96 8.2 %
2020-1 Series A, due through 2032552 4.1 %594 4.1 %
2020-1 Series B, due through 2028136 7.8 %155 7.8 %
Fixed rate enhanced equipment notes, due through 202361 4.4 %88 4.5 %
Fixed rate equipment notes, due through 2028448 4.2 %622 4.2 %
Floating rate equipment notes, due through 202856 6.9 %103 2.7 %
2020 aircraft sale-leaseback transactions, due through 2024341 7.3 %347 7.4 %
Finance Leases2 6.1 %3 6.1 %
Unsecured Debt
Unsecured CARES Act Payroll Support Program loan, due through 2030259 2.0 %259 2.0 %
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031144 2.0 %144 2.0 %
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031132 2.0 %132 2.0 %
0.50% convertible senior notes, due through 2026
750 0.5 %750 0.5 %
Total debt and finance lease obligations$3,676 $4,042 
Less: Debt acquisition cost(29)(36)
Less: Current maturities(554)(355)
Long-term debt and finance lease obligations$3,093 $3,651 
Schedule of maturities of long-term debt
Maturities of our debt and finance leases, net of debt acquisition costs, for the next five years are as follows (in millions):
Maturities
2023$547 
2024330 
2025192 
2026929 
2027174 
Thereafter1,475 
Carrying amounts and estimated fair values of long-term debt
The carrying amounts and estimated fair values of our long-term debt, net of debt acquisition costs, at December 31, 2022 and 2021 were as follows (in millions):
December 31, 2022December 31, 2021
Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
Public Debt
Fixed rate special facility bonds, due through 2036$42 $43 $42 $45 
Fixed rate enhanced equipment notes:
2019-1 Series AA, due through 2032504 345 532 442 
2019-1 Series A, due through 2028157 124 166 150 
2019-1 Series B, due through 202782 87 94 121 
2020-1 Series A, due through 2032546 457 587 634 
2020-1 Series B, due through 2028135 142 153 199 
Non-Public Debt
Fixed rate enhanced equipment notes, due through 202361 60 88 88 
Fixed rate equipment notes, due through 2028447 422 620 706 
Floating rate equipment notes, due through 202856 49 103 99 
Unsecured CARES Act Payroll Support Program loan, due through 2030259 126 259 219 
2020 sale-leaseback transactions, due through 2024341 329 347 374 
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031144 68 144 121 
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031132 62 132 111 
0.50% convertible senior notes, due through 2026
739 534 736 673 
Total(1)
$3,645 $2,848 $4,003 $3,982 
(1) Total excludes finance lease obligations of $2 million and $3 million at December 31, 2022 and 2021, respectively.