Dubai is hoping to one day have flying, pilotless taxis darting among its skyscrapers.
Just this week, the city-state in the United Arab Emirates hosted crews from the German company Volocopter, which had an electric, battery-powered two-seat prototype take off and land.
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Dubai hopes to have rules in place to govern such aircraft in the next five years.
The Volocopter's designers envision the electric, battery-powered two-seat helicopters taking off and landing from pads set up across the city.
The prototype used in Dubai has a maximum flying time of 30 minutes at 50 kph (31 mph), with a maximum airspeed of 100 kph (62 mph). Batteries charged in climate-controlled areas near the pads would be swapped in as needed.