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Debt (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Summary of Long-Term Debt |
(In millions) |  | Maturity Dates |  | Interest Rate(s) at December 31, 2023 |  | At December 31,
|  |  |  | 2023 |  | 2022
Aircraft notes (a) |  | 2024 | — | 2036 |  | 2.70 | % | — | 7.35 | % |  | $ | 12,508 |  |  | $ | 12,262 |
MileagePlus Senior Secured Notes |  |  | 2027 |  |  |  | 6.50 | % |  |  | 2,660 |  |  | 3,420 |
MileagePlus Term Loan Faci lity (b) |  |  | 2027 |  |  |  | 10.77 | % |  |  | 2,100 |  |  | 2,700 |
2026 and 2029 Notes |  | 2026 | — | 2029 |  | 4.38 | % | — | 4.63 | % |  | 4,000 |  |  | 4,000 |
2021 Term Loan s (b) |  |  | 2028 |  |  |  | 9.22 | % |  |  | 3,870 |  |  | 4,913 |
Unsecured |  |  |  |  |  |  |  |  |  |  |  |
Notes |  | 2024 | — | 2025 |  | 4.88 | % | — | 5.00 | % |  | 596 |  |  | 596 |
PSP Notes (c) |  | 2030 | — | 2031 |  |  | 1.00 | % |  |  | 3,181 |  |  | 3,181 |
Other unsecured debt |  | 2024 | — | 2029 |  | 0.00 | % | — | 5.75 | % |  | 437 |  |  | 508 |
|  |  |  |  |  |  |  |  |  | 29,352 |  |  | 31,580 |
Less: unamortized debt discount, premiums and debt issuance costs |  |  |  |  |  |  |  |  |  | (277) |  |  | (386) |
Less: current portion of long-term debt |  |  |  |  |  |  |  |  |  | (4,018) |  |  | (2,911) |
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ | 25,057 |  |  | $ | 28,283 |
(a)Financing includes variable rate debt based on the Secured Overnight Financing Rate ("SOFR") (or another index rate), generally subject to a floor, plus a specified margin of 0.49% to 2.25%. (b)Financing includes variable rate debt based on SOFR (or another index rate), subject to a floor, plus a specified margin of 3.75% to 5.25%. (c)The PSP Notes include $1.5 billion of indebtedness evidenced by a 10-year senior unsecured promissory note with Treasury provided under the PSP of the CARES Act ("PSP1"), $0.9 billion of indebtedness evidenced by a 10-year senior unsecured promissory note issued to Treasury pursuant to Payroll Support Program Extension Agreements under the CARES Act ("PSP2") and $0.8 billion of indebtedness evidenced by a 10-year senior unsecured promissory note issued to Treasury pursuant to the Payroll Support Program established under Section 7301 of the American Rescue Plan Act of 2021 ("PSP3"). These PSP Notes have a rate of 1.00% in years 1 through 5, and a rate of the SOFR plus 2.00% in years 6 through 10.
Contractual Principal Payments under Outstanding Long-Term Debt Agreements | The table below presents the Company's contractual principal payments (not including debt discount or debt issuance costs) at December 31, 2023 under then-outstanding long-term debt agreements in each of the next five calendar years (in millions):
2024 |  | $ | 4,018 |
2025 |  | 3,452 |
2026 |  | 5,245 |
2027 |  | 2,475 |
2028 |  | 5,306 |
After 2028 |  | 8,856 |
|  | $ | 29,352 |
Summary of Collateral Covenants and Cross Default Provisions | The collateral, covenants and cross default provisions of the Company's principal debt instruments that contain such provisions are summarized in the table below:
Debt Instrument | Collateral, Covenants and Cross Default Provisions
Aircraft notes and other notes payable | Secured by certain aircraft, spare engines and spare parts. The indentures contain events of default that are customary for aircraft financings, including in certain cases cross default to other related aircraft.
2021 Loan Facilities | Secured on a senior basis by security interests granted by the Company to the collateral trustee for the benefit of the lenders under the 2021 Loan Facilities, among other parties, on the following: (i) all of the Company's route authorities granted by the U.S. Department of Transportation to operate scheduled service between any international airport located in the United States and any international airport located in any country other than the United States (except Cuba), (ii) the Company's rights to substantially all of its landing and take-off slots at foreign and domestic airports, including at John F. Kennedy International Airport, LaGuardia Airport and Ronald Reagan Washington National Airport (subject to certain exclusions), and (iii) the Company's rights to use or occupy space at airport terminals, each to the extent necessary at the relevant time for servicing scheduled air carrier service authorized by an applicable route authority. The 2021 Loan Facilities contain negative covenants that, among other things, limit our ability under certain circumstances to create liens on the collateral, make certain dividends, conduct stock repurchases, make certain restricted investments and other restricted payments, and consolidate, merge, sell, or otherwise dispose of all or substantially all of our assets. The 2021 Loan Facilities also contain financial covenants that require the Company to maintain at least $2.0 billion of unrestricted liquidity at all times, which includes unrestricted cash, short-term investments and any undrawn amounts under any revolving credit facility, and to maintain a minimum ratio of appraised value of collateral to the outstanding debt secured by such collateral (including under the 2021 Loan Facilities) of 1.6 to 1.0, tested semi-annually. The 2021 Loan Facilities contain events of default customary for similar financings, including a cross-payment default and cross-acceleration to other material indebtedness.
2026 and 2029 Notes | The 2026 and 2029 Notes are secured on a senior basis by security interests granted by the Company to the collateral trustee for the benefit of the holders of the 2026 and 2029 Notes, among other parties, on the following: (i) all of the Company's route authorities granted by the U.S. Department of Transportation to operate scheduled service between any international airport located in the United States and any international airport located in any country other than the United States (except Cuba), (ii) the Company's rights to substantially all of its landing and take-off slots at foreign and domestic airports, including at John F. Kennedy International Airport, LaGuardia Airport and Ronald Reagan Washington National Airport (subject to certain exclusions), and (iii) the Company's rights to use or occupy space at airport terminals, each to the extent necessary at the relevant time for servicing scheduled air carrier service authorized by an applicable route authority. The indenture for these 2026 and 2029 Notes contains covenants that, among other things, limit our ability under certain circumstances to create liens on the collateral, make certain dividends, stock repurchases, restricted investments and other restricted payments, and consolidate, merge, sell, or otherwise dispose of all or substantially all of our assets. The indenture also contains a financial covenant that requires UAL to pay special interest in an additional amount equal to 2.0% per year of the principal amount of the 2026 and 2029 Notes for so long as it is unable to demonstrate that it maintains a minimum ratio of appraised value of collateral to the outstanding debt secured by such collateral (including the 2026 and 2029 Notes) of 1.6 to 1.0, tested semi-annually. The indenture contains events of default customary for similar financings, including a cross-payment default and cross-acceleration to other material indebtedness.
MileagePlus Senior Secured Notes and MileagePlus Term Loan Facility | Secured by first-priority security interests in substantially all of the assets of the Issuers, other than excluded property and subject to certain permitted liens, including security interests in specified cash accounts that include the accounts into which MileagePlus revenues are or will be paid by the Company's marketing partners and by the Company.
PSP Notes | The PSP Notes represent senior unsecured indebtedness of UAL. The PSP Notes are guaranteed by United. If any subsidiary of UAL (other than United) becomes, or is required to become, an obligor on unsecured indebtedness of UAL or any of its subsidiaries with a principal balance in excess of a specified amount, then such subsidiary shall be required to guarantee the obligations of the Company under the PSP Notes. Pursuant to the PSP Agreements, the Company and its affiliates will be required to comply with certain provisions including, among others, audit and reporting requirements and provisions restricting the payment of certain executive compensation until April 1, 2023.
Unsecured notes | The indentures for these notes contain covenants that, among other things, restrict the ability of the Company and its restricted subsidiaries (as defined in the indentures) to incur additional indebtedness and make certain dividends, stock repurchases, restricted investments and other restricted payments.

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