Uber has unveiled plans to partner with plane manufacturers to develop and test a network of flying cars by 2020. The ride-sharing company said it will run trials in the US city of Dallas and Dubai in the United Arab Emirates. The flying electric taxis are being developed with aviation companies including Embraer and Bell Helicopter. While the technology is largely unproven, Uber believes the service will eventually cost about the same as its car rides. Expanding on ideas first published in a white paper last October, the company said the electric vehicles will take off and land vertically like a helicopter, with zero emissions and minimal noise.