The use of carbon-neutral biomass energy for decarbonization is attracting more attention. In the aviation industry, introducing bio jet fuel is also considered essential for the reduction of greenhouse gas emissions from aviation fuel. Under such circumstances, Mitsubishi Power, Ltd. (Mitsubishi Power) succeeded in applying an integrated production system in which an entrained-bed biomass gasifier is combined with FT synthesis to produce bio jet fuel using woody biomass in a stable manner in this research and development. The effectiveness of the system was also verified.