Sept. 11, 2001: American Airlines Flight 77 streaked toward Washington, D.C., after being hijacked. NEADS – the North East Air Defense Sector of NORAD, received notice of the hijacking at 9:24 a.m. EST. Six minutes later, two F-16s were airborne from Hampton, Va. The pilots, however, had not received permission to engage and destroy – just head for Washington, D.C. Seven minutes after wheels up, the American Airlines passenger jet crashed into the Pentagon. This was the third hijacked flight used as a missile to kill and maim that morning. So far, the air defense was playing catch-up. Two minutes...