A ranking of sustainable aviation fuels (SAF) by Transport & Environment (T&E) warns of a double failure: Neither airlines nor oil companies have invested enough in e-kerosene, the transport association criticizes. 87 percent of the 77 airlines examined purchased too little SAF or the wrong type of SAF – for example, unsustainable biofuels made from foodstuffs such as corn instead of e-kerosene. This fuel, made from renewable electricity, is „the most sustainable and scalable type of SAF.“