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A plane fueled by fat and sugar has crossed the Atlantic Ocean
(www.washingtonpost.com)
geez, they do a lot of number juggling around this "sustainable air fuel", and I'm really very suspicious that when I look into it, all the sources are from places like british patrolium
The best I can get is that they are processing oil/crops into fuel - that's where the "sustainable" part comes from, because they can make more of it instead of digging it up out of the ground. They also have a lot of funny maths around the amount of carbon reduction, sometimes it's 40%, sometimes 60%, sometimes 80%.
The carbon 'reduction' seems to be not actually real, they are just finding ways of hiding the carbons - or using something that doesn't work at scale and using those numbers.
Ultimately, this is a ploy to keep planes flying and generating profit, hiding the environmental impacts so they can tell the governments that mandated action, that things are getting better.