Why do airlines use biofuels? It pays to advertise? A number of articles like this one, Why airlines keep pushing biofuels: They have no choice, are circulating on using biofuels in aviation. The use seems to be very small such as “FedEx, which burns 1.1 billion gallons of jet fuel a year, promised Tuesday to buy 3 million gallons per year of fuel that a company called Red Rock Biofuels hopes to make out of wood waste in Oregon. Southwest Airlines also has agreed to buy some of Red Rock’s planned output.” That works out to 0.3% of their fuel use.
To fill this need, we are supposedly going to use biofuels from all sources.
That leaves so-called advanced biofuels made from agricultural waste, trash or specialty crops that humans don’t eat. Last month, United Airlines announced a $30 million stake in Fulcrum Bioenergy, the biggest investment yet by a U.S. airline in alternative fuels.
Biofuels, other than ethanol, have different compositions and properties depending on source. Heat value, pour point, corrosive content may not make much difference in an automotive diesel. It needs to be blended with normal fuel. It’s not likely to make up a significant portion of aviation fuel. This sounds more like advertising.