Pound for pound, batteries pack far less energy than aviation fuel, which has as much as 40 times greater energy . That means batteries are stuffed everywhere there is space in Harbour Air's Beavers, Ganzarski said.
Given batteries' low energy density it likely will be decades before the world sees all-electric regional and large commercial jetliners, aerospace consultant Bjorn Fehrm writes for Leeham News and Analysis, a news site run by the Seattle-area aerospace consulting firm Leeham.
https://fortune.com/2019/12/10/electric-powered-commercial-airplane-makes-history/_- Steve
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