The FAA’s Sustainable Alternative Jet Fuels work includes several federal partnerships and research efforts. These include the Commercial Aviation Alternative Fuels Initiative (a coalition of airlines, aircraft and engine manufacturers, energy producers, researchers, international participants and U.S. government agencies promoting the development of alternative jet fuel options), and the ASCENT Aviation Sustainability Center (a cooperative aviation research organization of 16 universities and over 60 private sector stakeholders studying topics including alternative fuels and emissions standards).