This may be much closer than previously considered.
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 4 hr.up to 400 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 Alaka’i Technologies. Founded in 2015, the startup is aiming for FAA Part 21.17b certification in 2020 and is funded through to production by a single investor, he says
Skai