Some 70 years after the idea of flying cars popped up in the 1950s – widely dismissed at the time as Buck Rogers stuff – the concept is coming back and is no longer strictly the province of science fiction. By some estimates the flying car could be a commercial reality by 2030, while some promoters of “air mobility” says that they will have a car on the market by the end of this year that is a cross between a helicopter and a drone.