9/11 Was Allowed To Happen – Ground To Air Missile Defence And NORAD Failed To Respond

There Is A No Fly Zone Around All Sensitive Government Buildings Worldwide, Even In Australia, At Parliament House For Example. If An Aircraft Enters This No Fly Zone And Is Not Transmitting The Correct Transponder Code, Missiles Are Automatically Launched. Why Were No Missiles Launched Before The Alleged Flight Hit The Pentagon?