https://techcrunch.com/2021/09/09/solar-powered-aircraft-developer-skydweller-aero-adds-8m-to-series-a-partners-with-palantir/

Airplanes and drones today, regardless of size or fuel type, all face the same limitation: eventually they have to land.

Skydweller Aero, the U.S.-Spanish aerospace startup, wants to break free from that constraint by developing an autonomous solar-powered aircraft it says will eventually be capable of perpetual flight.