Topics › Transportation › Aviation › Emerging Aviation Technologies Example FAA Next Generation Air Transportation System A research collaborative, the NextGen portfolio encompasses the planning and implementation of innovative new technologies and airspace procedures. Documents Other Resources FAA NextGen program website View Related Resources Example FAA CLEEN program Executive Branch Example NASA advanced aviation research Executive Branch Resource Report, The Challenge of Decarbonizing Heavy Transport Executive Branch Resource US Aviation GHG Emission Reduction Plan Executive Branch Example FAA’s Sustainable Alternative Jet Fuels programs Executive Branch Example DOD Memorandum: Track Four Efficiency Initiatives Decisions Executive Branch