Fifty years after Apollo 11 landed on the Moon, and after an eight-year hiatus, humans will again fly into space from U.S. soil, with Blue Origin and Virgin Galactic expected to begin suborbital tourist flights and Boeing and SpaceX planning to fly astronauts to the International Space Station.Hybrid-electric or all-electric?The jury is still out on if and howto electrify aircraft propulsion,but startups including Zunum,VoltAero, Wright Electric andEviation plan to fly testbeds or prototypes for smallshort-haul aircraft in a bid to revitalize regional aviation.
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