I think it's a bad idea. But I saw a statistic saying the waste oil collected now could satisfy about 2% of the demand, and I think if we looked at thermal depo

I think it's a bad idea. But I saw a statistic saying the waste oil collected now could satisfy about 2% of the demand, and I think if we looked at thermal depolymerisation and hydroprocessing of other biodegradable waste we could possibly get up to a decent chunk, maybe 20-30%? If done with zero emissions energy that would be pretty carbon neutral. Not sure where we go after that for aviation, it's definitely one of the most tricky applications for alternate fuels. Maybe efuels would be next for some portion. Hopefully electric aircraft can eventually do regional short haul but I'm not holding my breath on energy densities getting competitive for that to take a huge chunk of aviation any time soon...