There have always been working prototypes in one form or another. I mean fuck, where do you think jets came from? They aren't going to let regular morons drive jets around. There also isn't any money in trying to create flying machines that aren't military jets. I remember watching videos of the Moller flying car in the early 2000s. They keep changing the machine as technology improves and the last I saw the price jumped from $250k back then to $5 million. It will never come out.