Uber Just Unveiled Its Flying "Air Taxi" Prototype. But Plenty Of Hurdles Remain.

At its Uber Elevate conference today, the ride-hail company unveiled a prototype of its next big bet: an electric air taxi that it plans to launch some trial runs as early as 2020 and have full rollouts in Los Angeles and Dallas in five years.
Yet as futuristic as it sounds, the Uber Air...
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