AS Ian W points out whats the point in not banning their use on US domestics. After all as I reminded the thread in an earlieir post 9-11 was US home grown affair. Only the people were non US , the means (flight training in that case) and the targets were both domestically focussed and I am sure buying a few electronic gadgets and getting hold of a small quantity of explosive is easier than sending a bunch of people through basic flight school. No its blanket ban or nothing if it is to be effective otherwise it just perpetuates the myth that foreigners are the threat to the USA. However 9-11 , The Fed Building in Oklahoma? Boston Marathon and various other incidents makes it very the that 'the real enemy is within' but that doesn't suit the 'wall mentality' does it