This makes me wonder how many time this is done and we do not hear about it, or how many time this is done and our wonderful TSA does not even catch them?
This may be a bit too optimistic, but I think that we're catching them all. Why? Because if they had gotten through more than a couple of times at any given airport, they would have put a bomb on a plane by now. It seems to me that they're checking each hub to see if the local security procedures are lax, and when they find a place where they can get a bomb on board they will send several bombs through that airport.