NASA shows off its first all-electric plane, the X-57 Maxwell at NASA's Armstrong Flight Research Center at Edwards Air Force Base, California, U.S., November 8, 2019. NASA, most prominent for its many Florida-launched exploits into space, showcased an early version of its first all-electric experimental aircraft, the X-57 "Maxwell." REUTERS/Mike Blake

Technicians work on NASA's first all-electric plane, the X-57 Maxwell, at NASA's Armstrong Flight Research Center at Edwards Air Force Base, California, U.S., November 8, 2019. Adapted from a Italian-made Tecnam P2006T twin-engine propeller plane, the X-57 has been under development since 2015 and remains at least a year away from its first test flight in the skies over Edward Air Force Base. REUTERS/Mike Blake

Technicians work on NASA's first all-electric plane, the X-57 Maxwell, at NASA's Armstrong Flight Research Center at Edwards Air Force Base, California, U.S., November 8, 2019. NASA also showed off a newly built simulator that allows engineers, and pilots, to get the feel of what it will be like to maneuver the finished version of the X-57 in flight, even as the plane remains under development. REUTERS/Mike Blake

Technicians work on NASA's first all-electric plane, the X-57 Maxwell, at NASA's Armstrong Flight Research Center at Edwards Air Force Base, California, U.S., November 8, 2019. NASA's X-57 venture is aimed at designing and proving technology according to standards that commercial manufacturers can adapt for government certification. REUTERS/Mike Blake

An electric motor is shown being installed on the wing of NASA's first all-electric plane, the X-57 Maxwell, at NASA's Armstrong Flight Research Center at Edwards Air Force Base, California, U.S., November 8, 2019. The final modification, or Mod IV, of the aircraft will feature narrower, lighter-weight wings fitted with a total of 14 electric engines - six smaller "lift" props along the leading edge of each wing, plus two larger "cruise" props at the tip of each wing. REUTERS/Mike Blake

Technicians work on NASA's first all-electric plane, the X-57 Maxwell, at NASA's Armstrong Flight Research Center at Edwards Air Force Base, California, U.S., November 8, 2019. REUTERS/Mike Blake