Wow! Imagine what that would be like given the number of "suspicious" flyers reported by fellow pax. Imagine wading into a mélee of 200 (or even 20) untrained armed travellers.
Fact is that the hideous 9/11 attacks were a long, long time in the planning, were low-tech attacks designed to catch a sleepy system off-guard, and have already had the desired effect: the killing of many people, the toppling of a symbol of Ameican culture and business, and the burdening of the American population with fear and fear based hastily constructed "security" which cost us dearly in money, dignity and freedom.
Yes, we need security at airports. We also need intelligence and professionalism in the desigh and delivery. What we have is an overblown panic induced, inefficient and non-agile system.
If there were really lots of terrorists out there, we surely would have seen more terror focused on other forms of transportation or other kinds of gathering places.