A test flying taxi recently flew over Singapore's crowded waterfront, eventually expecting to lead to normal air service in traffic-choked Asian cities.The 18-prop German-made chopper may soon regularly carry passengers.

Volocopter has already successfully tested in Dubai, Helsinki, Germany and Las Vegas. Singapore may be among the first to get the regular daily service within two to four years. Fares are expected to be moderately higher than charged for earthbound taxis. However, the dangers of the new air taxis and delivery drones accidentally hitting other vehicles and people have yet to be considered by local officials and eager lawyers.