Joby Aviation and other ambitious companies collectively have raised billions of dollars to turn air taxis into reality.

Federal regulators gave a strong push to electric-powered air taxis Oct. 22 by issuing a final rule for operating the aircraft and how pilots will be trained to fly them.

Toyota is boosting its investment in air taxi manufacturer Joby Aviation by $500 million to support plans for commercial production, bringing its total investment to $894 million.

Joby Aviation Inc. expects to launch its flying taxi service in Dubai before anywhere else, including the startup’s home turf in the U.S.