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Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract] |
Firm Commitments and Options to Purchase Aircraft and Summary of Commitments | As of March 31, 2021, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing"), Airbus S.A.S. ("Airbus") and Embraer S.A. ("Embraer") as presented in the table below:
|  |  |  | Scheduled Aircraft Deliveries
Aircraft Type |  | Number of Firm Commitments (a) |  | Last Nine Months of 2021 |  | 2022 |  | After 2022
Airbus A321XLR |  | 50 |  |  | — |  |  | — |  |  | 50 |
Airbus A350 |  | 45 |  |  | — |  |  | — |  |  | 45 |
Boeing 737 MAX |  | 180 |  |  | 13 |  |  | 40 |  |  | 127 |
Boeing 787 |  | 9 |  |  | 9 |  |  | — |  |  | — |
Embraer E175 |  | 4 |  |  | 4 |  |  | — |  |  | — |
(a) United also has options and purchase rights for additional aircraft. |  |  |  |  |  |  |  |
Summary of Commitments | The table below summarizes United's commitments as of March 31, 2021, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments (in billions):
Last nine months of 2021 |  | $ | 4.0 |
2022 |  | 2.9 |
2023 |  | 2.8 |
2024 |  | 1.7 |
2025 |  | 2.1 |
After 2025 |  | 10.2 |
|  | $ | 23.7 |
Based on these assumptions as of March 31, 2021, 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 2021 |  | $ | 1.6 |
2022 |  | 2.1 |
2023 |  | 1.9 |
2024 |  | 1.7 |
2025 |  | 1.4 |
After 2025 |  | 3.7 |
|  | $ | 12.4 |

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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