In practice it's mostly that, but to a way lesser degree it's other kinds of tech - even direct CO2 capture (although that one is very expensive). Here is a de

In practice it's mostly that, but to a way lesser degree it's other kinds of tech - even direct CO2 capture (although that one is very expensive). Here is a definition from EASA: https://www.easa.europa.eu/eco/eaer/topics/sustainable-aviation-fuels/what-are-sustainable-aviation-fuels#drop-in-saf-production-pathways https://www.easa.europa.eu/eco/eaer/topics/sustainable-aviat... Lufthansa's Compensaid originally had a whole portfolio of projects that delivered SAF, but I can see that they mostly switched to cooking oil by now. https://lufthansa.compensaid.com/projects/sustainable-aviation-fuel https://lufthansa.compensaid.com/projects/sustainable-aviati...