You do not know what made this fear happen and I sincerely doubt it is from your scenario. The brain makes very quick associations and to me this is a very primal, not intellectual thing for him. He mentioned only being afraid in a particular situation, flying. I would suspect that he is a nervous flyer to start with and has all sorts of loose fear looking for something to be attached to. He probably saw a lot of ugly footage from 9/11 and has connected the two. That is my most likely guess. We do not know. Since you are probably wrong in your analysis, no offense, he probably can't realize what you want him to realize. mg