Biodiesel has been around since the early 1900′s when pioneers tinkered with a variety of biofuels to power vehicles.
The preferred source of biofuel for home users has been spent cooking oil, which is also the same for most commercial operations looking to power anything from ships to airplanes.
In two recent feasibility experiments, European airlines KLM and Thompson Airlines have integrated cooking oil-based biofuels into their passenger routes, in a 50-50 mixture with jet fuel.
(READ the story in EarthyReport)