Some Arab in a cave in Afghanistan iluded a 40billion dollar defense system... yep. In freaking countries like Australia if a plane enters the parlament airspace you have to enter an authorization code, if you don't enter the code your plane will be shot down by automatic missile systems. Yet, after NY being attacked 2 times another plane managed to fly over a Nuclear power plant, pass by the White House, enter pentagon airspace, turn arround and hit the pentagon in the only zone where the walls were being reforced for this kind of attack... I remember about that one, someone asked, "why didn't they hit the nuclear plant instead if they wanted to hurt us?" response, "well, they probably thought it was well guarded"... so they decided to enter the most secured airspace in the world and hit the most secured building in the world instead...