The Bell Nexus concept "flying car" is shown at the Uber Elevate summit in Washington, DC on June 11, 2019, one of several that will make up a fleet of electric aircraft Uber expects to deploy by 2023. - Uber on June 11, selected Mebourne, Australia, as the first non-US city for its aerial ridesharing service expected to launch in 2023 as it unveiled new partners for the ambitious initiative. Melbourne was named the third official pilot city for Uber Air, joining Dallas and Los Angeles. Test flights are to start in 2020 with commercial operations planned for 2023. (Photo by Robert LEVER / AFP)

The Bell Nexus concept vehicle is shown at the Uber Elevate Summit June 11, 2019 in Washington, DC, one of the vertical takeoff and landing (VTOL) vehicles or flying cars that will be part of Uber's fleet for aerial ride sharing. - Uber on June 11, selected Mebourne, Australia, as the first non-US city for its aerial ridesharing service expected to launch in 2023 as it unveiled new partners for the ambitious initiative. Melbourne was named the third official pilot city for Uber Air, joining Dallas and Los Angeles. Test flights are to start in 2020 with commercial operations planned for 2023. (Photo by Robert LEVER / AFP)

The Bell Nexus concept "flying car" is shown at the Uber Elevate summit in Washington, DC on June 11, 2019, one of several that will make up a fleet of electric aircraft Uber expects to deploy by 2023. - Uber on June 11, selected Mebourne, Australia, as the first non-US city for its aerial ridesharing service expected to launch in 2023 as it unveiled new partners for the ambitious initiative. Melbourne was named the third official pilot city for Uber Air, joining Dallas and Los Angeles. Test flights are to start in 2020 with commercial operations planned for 2023. (Photo by Robert LEVER / AFP)