Thank you. Actually, the term “drop-in” is exactly that. The aviation biofuel looks exactly like and acts exactly like jet fuel. Currently the specifications today allow for a mix of 50%, a blend, and the newer technologies coming out are targeting 100% aviation biofuel. So some of what the FAA money has recently been invested has been to look at what the longer-term effects are on the engine; but the ASTMs of the world and the CGSBs and the engine manufacturers have spent a lot of time investigating. It looks exactly the same but it has a reduced carbon impact at the end of the day.
On May 10th, 2012. See this statement in context.