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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Summary of Commitments to Purchase Aircraft | As of December 31, 2019, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing"), Airbus S.A.S. ("Airbus") and Embraer S.A. ("Embraer") presented in the table below:
|  |  |  | Scheduled Aircraft Deliveries
Aircraft Type |  | Number of Firm Commitments (a) |  | 2020 |  | After 2020
Airbus A321XLR |  | 50 |  |  | — |  |  | 50 |
Airbus A350 |  | 45 |  |  | — |  |  | 45 |
Boeing 737 MAX |  | 171 |  |  | 44 |  |  | 127 |
Boeing 777-300ER |  | 2 |  |  | 2 |  |  | — |
Boeing 787 |  | 16 |  |  | 15 |  |  | 1 |
Embraer E175 |  | 20 |  |  | 20 |  |  | — |
(a) United also has options and purchase rights for additional aircraft. The table below summarizes United's commitments as of December 31, 2019, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments (in billions):
2020 |  | $ | 6.9 |
2021 |  | 4.3 |
2022 |  | 2.0 |
2023 |  | 1.0 |
2024 |  | 1.2 |
After 2024 |  | 11.3 |
|  | $ | 26.7 |

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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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