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Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Firm Commitments | As of March 31, 2024, United had firm commitments to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") as presented in the table below:
|  |  |  | Contractual Aircraft Deliveries |  | Expected Aircraft Deliveries (b)
Aircraft Type |  | Number of Firm Commitments (a) |  | Last Nine Months of 2024 |  | 2025 |  | After 2025 |  | Last Nine Months of 2024 |  | 2025 |  | After 2025
787 |  | 150 |  |  | 8 |  |  | 18 |  |  | 124 |  |  | 5 |  |  | 12 |  |  | 133 |
737 MAX 8 |  | 36 |  |  | 36 |  |  | — |  |  | — |  |  | 19 |  |  | 17 |  |  | — |
737 MAX 9 |  | 144 |  | 34 |  |  | 40 |  |  | 70 |  |  | 10 |  |  | 44 |  |  | 90 |
737 MAX 10 |  | 167 |  | — |  |  | — |  |  | 167 |  |  | — |  |  | — |  |  | 167 |
A321neo |  | 123 |  |  | 23 |  |  | 38 |  |  | 62 |  |  | 22 |  |  | 24 |  |  | 77 |
A321XLR |  | 50 |  |  | — |  |  | 8 |  |  | 42 |  |  | — |  |  | 1 |  |  | 49 |
A350 |  | 45 |  |  | — |  |  | — |  |  | 45 |  |  | — |  |  | — |  |  | 45 |
(a) United also has options and purchase rights for additional aircraft.
(b) Expected aircraft deliveries reflect adjustments to contractual delivery schedules as communicated by Boeing and Airbus or estimated by United. However, aircraft deliveries are subject to a number of variables, as further described in Part I, Item 1A. Risk Factors of the 2023 Form 10-K, and we cannot guarantee delivery of any particular aircraft at any specific time notwithstanding firm purchase commitments.
Schedule of Commitments | The table below summarizes United's firm commitments as of March 31, 2024, which include aircraft and related spare engines, aircraft improvements and non-aircraft capital commitments. Aircraft commitments are based on contractual scheduled aircraft deliveries without any adjustments communicated by Boeing and Airbus or estimated by United but reflecting the discounts related to future deliveries offered as part of the April 14, 2024 arrangements between United and Boeing.
(in billions) |  |
Last nine months of 2024 |  | $ | 7.1 |
2025 |  | 7.4 |
2026 |  | 5.5 |
2027 |  | 4.3 |
2028 |  | 6.4 |
After 2028 |  | 27.1 |
|  | $ | 57.8 |
Schedule of Estimated Future payments of Contractual Obligation | Based on these assumptions as of March 31, 2024, our estimated future payments through the end of the terms of our CPAs are presented in the table below:
(in billions) |  |
Last nine months of 2024 |  | $ | 1.9 |
2025 |  | 2.3 |
2026 |  | 2.2 |
2027 |  | 1.8 |
2028 |  | 1.3 |
After 2028 |  | 4.2 |
|  | $ | 13.7 |

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