Planes can run off of biodiesel made from oil extracted from algae or waste vegetable oil. The remaining carbohydrates in the algae can be turned into ethyl al

Planes can run off of biodiesel made from oil extracted from algae or waste vegetable oil. The remaining carbohydrates in the algae can be turned into ethyl alcohol by yeast, or Acetone/Butanol/Ethanol by the ABE fermentation cycle and the protein can be used for animal consumption, or anaerobic respiration into methane. All of these are suitable fuel sources.