I'd like to think that the GA community is full of law abiding citizens who would never consider doing anything to jeopardise others, but with the way the world is these days I guess you've got to expect it. What's to stop Mr Terrorist landing his light aircraft at an airport, then meeting his mate in the car park who gives him a ruck sack which he then takes airside? I've been to a few regional airports where you have to walk some distance from the GA park to the terminal, passing several passenger carrying aircraft on the way.