According to this article it seems that the biggest barrier between us and the staple icon of the future, that we have always imagined in movies and books, is psychologically and socially. The technology itself already exists.
According to Missy Cumming’s account, we will be a lot safer when we allow a computer to takeover navigation and driving (I mean flying). It will have real meaning in the personal lives, in terms of safety and efficiency in traveling.
Asnother source on BBC News added “”sense and avoid” avionics, computer-aided design, and materials science – has advanced to such a degree that safety authorities are tantalisingly close to giving full approval to flying cars.”