I would bet they would have read the mannerisms of Santiago and got him before he entered the baggage area. There needs to be people upstairs at these air ports watching and studing people. Kroger and many stores have this kind of security. Why not air ports and they could notifly the ground agents to stop and ask questions. Good on target questions. Tough Sh#t if they offend people but we would all know it was for our life.
He had had an argument on the airplane
All this we now know could have been check while plane was in flight.
Then security could meet the plane?