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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.