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In order to be used in commercial flights, a sustainable aviation fuel (SAF) has to comply with ASTM D4054. As of June 2020, 8 conversion processes have been approved for SAF production.
In order to be eligible for use within the ICAO Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA), SAF must also meet a set of sustainability criteria. More information on CORSIA eligible fuels is available on the dedicated CORSIA Eligible Fuels webpage.