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When will we have flying taxis?

The taxi company Uber is setting its sights on developing an airborne service, hiring a veteran NASA engineer to develop a flying taxi prototype. So, how do these plans fit into existing progress on flying cars? Dan Damon has been speaking to Guy Gratton, Professor of Airborne Science at Cranfield University:

(Photo of a combined car and aeroplane by Keystone/Getty Images)

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4 minutes