Sustainable aviation fuel is a drop-in fuel, which means it can be commingled with traditional fossil jet fuel, which is used in aircraft today. It's produced from renewable sources, and it reduces the GHG impact by about 80% on a per-mile basis.
There are various feedstocks that can be used. Primarily the feedstock that is used right now is called HEFA, or waste, fats and oils. It means everything from cooking oils to animal renderings, and there is limited production capacity in North America.
California, as a jurisdiction, made investments—the investments we are asking the Canadian government to make. They made those investments almost a decade ago and now they are a sustainable aviation fuel powerhouse. They produce the vast majority of the sustainable aviation fuel that is created right now around the world, and they consume almost all of the SAF they create locally. They are also importing SAF because of the generous incentives that are in place.