https://techcrunch.com/2021/09/09/sustainable-jet-fuel-company-alder-fuels-seals-investments-from-united-honeywell/

The aviation industry is notoriously difficult to decarbonize, in part because airplanes use a petroleum-based fuel to fly.

Alder Fuels wants to change that. The new cleantech company, headed by Bryan Sherbacow, is developing a low-carbon jet fuel that can be used as a 100 percent drop-in replacement for petroleum fuel, without needing to adapt existing aircraft or engines. That’s notable because the only commercially available sustainable aviation fuel (SAF) still requires a 50-50 blend with conventional fuel.