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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule of Commitments to Purchase Aircrafts | The table below summarizes United’s commitments as of December 31, 2016, which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and include other capital purchase commitments for the years ended December 31 (in billions). Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.
2017 |  | $ | 4.5 |
2018 |  |  | 3.2 |
2019 |  |  | 3.1 |
2020 |  |  | 2.5 |
2021 |  |  | 2.2 |
After 2021 |  |  | 7.8 |
|  | $ | 23.3 |
Aircraft Type |
Schedule of Commitments to Purchase Aircrafts | Commitments. As of December 31, 2016, United had firm commitments and options to purchase aircraft from The Boeing Company (“Boeing”), Embraer and Airbus presented in the table below:
Aircraft Type |  | Number of Firm Commitments (a) |
Airbus A350-1000 |  |  | 35 |
Boeing 737NG/737MAX |  |  | 165 |
Boeing 777-300ER |  |  | 12 |
Boeing 787-8/-9/-10 |  |  | 21 |
Embraer E175 |  |  | 24 |
(a) United also has options and purchase rights for additional aircraft. |

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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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