Hydrogen, Solar, Friction... planes, drones (medi, delivery, transport...), choppers - there are so many options.
I hope to see many at future #PacificAirshows #GoldCoast
eVITOLs: https://amprius.com/evtol/
How are they powered? https://www.google.com/amp/s/abcnews.go.com/amp/Politics/new-21-stealth-bomber-unveiled/story%3fid=94353024
Friction: https://robbreport.com/motors/aviation/business-jet-air-friction-power-2905135/
Photovoltaic: https://www.azom.com/article.aspx?ArticleID=21135#:~:text=Sunrise%2C%20the%20world's%20first%20solar,electrical%20energy%20using%20photovoltaic%20panels.