Sounds to me like you have your head buried in the sand. If you're such an expert, why do you get your information from the Discovery Channel? Please tell, Mr. Military Superior Explosives Expert Potentate, all about the PETN they found on the seat backs, and how it got there from a spontaneous center fuel tank explosion?
PETN is not a missile fuel, it is an explosive. It is usually a part of an explosive train. The main use is in Det Chord.