. >> mary schavio, i was trying to give jim your question here. i will give it to you now.his says decompression caused by fatigue or deliberate act? and nina says couldn't this have begun as faulty escalation and continued when all died but him. >> it is possible. we have had other incidents where we have had cabin decompression. one is with a maintenance crew forget to turn back on the automatic pressurization. another is from a crack in the fuselage. it's possible. at that point, you would assume if everyone else perished, except for the pilot, presumably there was lack of control surfaces, too. otherwise he would have taken the plane home and delivered the loved ones though perished back to the airport. there must have been something with lack of control of the plane. >> this is about electrical control system. john cook asks this. he says, what's the probability that an electrical issue rendered the acars and radio systems inoperable. geoffry, what about that? >> jeffrey thomas. >> sorry, okay. beg your pardon. electrical problem -- the you have power from the engines.