Will the real Stealth Technology Please Stand-up ?

Despite billions spent on stealth technology, expensive spy satellites and planes, secret listening post throughout the world , Echelon and Carnivore. It seem inconceivable that an terrorist operation of this magnitude could be planned, setup over the course of 1 year and executed with precision without the intelligence community having a clue. Now that the country's defense and intelligence spending has been exaggerated in the wrong direction for so long. Maybe good old fashion human intelligence is more secure than once thought.?? This swiss-cheese National defense system lacks imagination, is based solely upon pasted events and will ultimately prompt future attacks. Chance favors the prepared mind.