The SAF model in BioSTEAM simulates the production SAF from cellulosic biomass (i.e., miscanthus) via the ATJ pathway, consistent with Wei et al. The SAF production process includes two steps: ethanol production and ethanol upgrading via dehydration, oligomerization, and hydrogenation. The biorefinery uses 0.821 million metric tons of miscanthus per year and produces several hydrocarbons: SAF as the main product and gasoline and diesel as co-products.