Some aircraft can already use the available 94-octane unleaded fuel from Swift Fuels and, in some cases, unleaded automotive fuel of certain octane levels and without ethanol. However, it is the pilot’s and aircraft owner’s responsibility to know if their aircraft has been approved for these unleaded fuels (and, if so, have purchased the appropriate supplemental type certificate [STC]) and where they may be able to buy it. The industry is working on a smart transition toward an unleaded solution that will work for the entire GA fleet.