There's a flying car company, Terrafugia (1), that came out of MIT ten years ago and they have working prototypes. There's an old YouTube video here (2) and apparently they have "persuaded the FAA to grant Terrafugia a waiver of weight and stall-speed limits so it can self-certify its Transition flying car as a light sport aircraft" (3).

Not sure of the safety implications or the commercial viability of flying cars for Uber, but there are people out there who want to be able to own or fly an aircraft and not have to deal with various hassles that come with traditional aircraft ownership.

1. https://www.terrafugia.com/

2. https://www.youtube.com/watch?v=nnF2yua4KIw

3. http://aviationweek.com/technology/faa-light-sport-aircraft-...