A type of biofuel made from renewable sources, such as waste or biomass, is called SAF or sustainable aviation fuel. Compared to traditional jet fuel, SAF has many advantages, as it can be used in existing aircraft without any modification and it has a lower carbon footprint. A recent article published in Aerospace reported that the use of a 50% SAF mix on the 2% of flights that produce the most intensely heated contrails reduces the overall energy forcing produced by aircraft by 6%. SAF with minimal aromatic compounds and low sulfur concentrations can also improve local air quality. Different types of SAFs are being researched and developed, such as Jatropha-based SAF, Algae-based SAF, Waste-to-fuel SAF, etc.