The electric airplane’s evolution—some see it as a revolution—is about to ascend to a new level. Bye Aerospace's two-seat Sun Flyer flew for the first time April 10, a noteworthy Rocky Mountain high. That flight was a major milestone for the small but ambitious company, based at Centennial Airport just south of Denver. If the sun shines brightly on its development progress, the little lithium-ion-battery-powered aircraft could earn FAA Part 23 certification ...


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