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Sustainable Aviation Fuel (SAF) is an aviation fuel made from sustainable and renewable sources which can act as a substitute for fossil jet fuel.
SAF is perhaps best understood as a collective term for many different types of fuel. It is the feedstock – what goes into the mix to create the SAF – as well as the process by which it is made that determines just how “sustainable” the fuel is.
Most existing forms of SAF might also be termed biofuels, which, as the name suggests, means a fuel produced from biological resources (plant or animal material) but which also includes used cooking oil, and municipal and household waste. It is also possible to create synthetic fuels from hydrogen and carbon dioxide – these are often referred to as e-kerosene, power-to-liquid and e-fuels. As an added complication, some NGOs, such as clean transport campaign group Transport and Environment, use the term SAF to refer to “sustainable advanced fuels”. These are the same as sustainable aviation fuels but don’t carry the implication that the fuels have to be used for aviation. https://www.businesstraveller.com/features/what-is-sustainable-aviation-fuel-saf/
