after working in many ctr wing tanks of 747's i find it hard to swallow ,shorted wire or not .capton wiring etc ,at 13800 ft exactly how much is the oxygen to air component for a spark to take place also fuel vapour jeta or a1 is not easy to ignite thats why ignition systems on engines is 4 joule or ten joule for inflight start,have thrown cigarette buts into buckets of jet a at ground level and never a flash ,conspiracy i love but call mulder because you will never know