This seems like a stretch but imagine a very large drone with 18 rotors to carry people through the sky like a taxi. That’s Volocopter. Roberto Baldwin explains:
The drone’s 18 rotors are powered by nine batteries which power two rotors each. The tiny propellers that share a battery are on opposite ends of the aircraft. That way if a battery fails, it won’t seriously affect the stability of the Volocopter. The powerpack will keep the aircraft in the sky for 30 minutes: long enough for urban air-transportation
Self driving cars, meet self driving drones that carry people.