A U.S. startup is preparing to fly a full-scale, five-seat electric vertical-takeoff-and-landing (eVTOL) aircraft that is powered not by batteries or hybrid-electric propulsion, but by hydrogen fuel cells. The result is a vehicle the developers say can fly for 3 hr., up to 300 mi. between cities and not the short hops envisioned for urban air taxis. FAA certification of the Skai has been underway for 10 months, says Brian Morrison, president and co-founder of Massachusetts-based ...

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