Background: In April 2010 contamination in jet fuel caused the throttles of two engines on a Cathay Pacific flight to stick while in flight and nearly caused the lives of 322 passengers and crew on board. Such incident is just one of the examples of the dangers posed by cross contamination in the fuel. FAME or biodiesel has the property to ‘stick’ to surfaces and small traces of FAME can be found in jet fuel leading to cross contamination. At high concentrations FAME may impact the thermal stability of the jet fuel leading to coke deposits in the fuel system.