Unfortunately, NONE of the security measures to be adopted would have stopped Tuesday's attacks. The only two things that might have stopped them would be:

1. racial profiling (unlikely in this PC world but effective)-- no carryons and strip searches for all people with Semitic names and/or travelling with foreign ID from a middle eastern country; and

2. elimination of all carryons for everyone(unlikely b/c complaints, but I could adapt)-- but I have often thought about it: I could easily hide a weapon in an empty drive bay of my laptop or carry a knife hidden in a customized extra battery, etc. If they eliminated carryons, they could also designate a special lockable closet where all fragileitems that can't be checked could go to until landing; don't like it, take the bus or train.