How are they going to do that ? With battery powered turbofans ?
Rubber bands.
“How are they going to do that ? With battery powered turbofans ?”
No, it’s going to be something like those ancient warships. So instead of a hundred men rowing, there will be passengers flapping their arms.
Airbus plans hydrogen fuel which has three times the energy per kg as jet fuel but is more difficult to store.
https://www.airbus.com/innovation/zero-emission/hydrogen/zeroe.html
Iceland air plans to also use hydrogen in prefilled capsules for regional flights. Iceland has virtually unlimited geothermal power so they can very cheaply make hydrogen via electrolysis. They already use dirt cheap geothermal to smelt aluminum on a scale no where else in the world with aluminum smelting being one of the most energy intensive processes on a kg for kg output of product.
Seattle has already flown an all electric seaplane and plans to use them for short range hops around Puget sound region.
https://crosscut.com/2019/12/worlds-first-commercial-electric-aircraft-could-take-pnw
The same group is also targeting smaller regional flights. The economics of electricity vs $6.10+ gallon JetA is compelling as in five times cheaper per flight hour. 100LL is nearly $7 a gallon
https://flightaware.com/resources/airport/KADS/services/FBO/Atlantic_Aviation_Addison