This article outlines the history of GHG reduction in international aviation, the scheme of GHG reduction certification(CORSIA), the quality standard for safety use of SAF(ASTM), manufacturing technologies, and combustion behavior of SAF. In COP3 held in Kyoto in 1997, it was resolved that ICAO addresses GHG reduction in international aviation sector. ICAO has established the CORSIA and has started pilot operation with voluntary participation from 2021. CORSIA contains certification of degree of GHG emission in using various type of SAFs and GHG reduction by airlines. CORSIA defined three technical measures to achieving GHG reduction. Among three measures, SAF is assumed to contribute the most to reduction of GHG. COSIA includes certification scheme of GHG reduction accounting and sustainability criteria of SAF (CEF certification). ASTM certification is another certification(standard) scheme for commercial usage of SAF, which is required at the time of in starting CEF certification. In ASTM, SAF should be used within 50% of blending ratio (depending of the SAF type) against Jet A-1 or Jet A at present. In Apr. 2021, the work group has started for establishment of standard of 100% SAF specification. When considering 100% SAF standards, it is important to evaluate the impact of SAF on jet engine's components and combustion. A report on the behavior of HEFA-SPK in a small gas turbine engine was introduced. Some findings are described in the literature in terms of differences in combustion behavior such as emission.
