This 15-page report evaluates a pathway for sustainable aviation fuels, feeding biogas into a Fischer-Tropsch reactor. Three projects are in progress. But bio-GTL will likely cost 3x more than conventional jet fuel, for a 75% reduction in CO2, giving an abatement cost of $550/ton. Moreover, the same biomass feedstock could abate 4x more CO2 via other pathways. We still prefer nature-based carbon offsets to decarbonize aviation.