Uber is one step closer to going airborne. On Wednesday, the company previewed its air taxi booking service ahead of an expected launch in Dubai later this year. The inaugural Uber Air program will let travelers book Joby Aviation's electric air taxis through a familiar process in the Uber app.The experience of booking an air taxi will be much like reserving a four-wheeled Uber. In the app, after entering your destination, Uber Air will appear as an option for eligible routes. The Uber app w...