Re: Do we really need this ?
"If it's for an expensive executive service, then it's an ideal candidate for expensive synthetic fuel, so it doesn't have to have a big carbon footprint."
Synthetic fuels to date have had a huge carbon footprint. Ethanol is massively energy negative. It's only good at creating jobs. If I were on a supersonic jet, I'd feel much more comfortable if the fuel was consistent. There's no telling how different blends might perform and how they could react with each other in fuel tanks. Aviation has such a diverse set of requirements for fuel that it's going to be a long time before there is a good substitute for kerosene. The low hanging fruit is passenger cars diminishing towards HGV's and farm machinery.
Biting the hand that feeds IT
