Think 'Phantom Menace'. Remember the pod race scenes? It looks like they'll be closer to reality soon, and it even has FAA support! I must admit, I'm a tad worried about the idea of an out-of-control plane like this flying towards the crowd, and knowing full well that you can't get safety levels up to anywhere near what they're like in F1, which is high speed on the ground...
http://news.bbc.co.uk/1/hi/sci/tech/4307538.stm