Normally, if the system had worked as designed, top officials at the FAA in Washington would contact the Pentagon’s National Military Command Center, which in turn would call the North American Aerospace Defense Command, or NORAD, the military organization responsible for protecting the skies over the United States and Canada. NORAD, in turn, would ask approval from the Secretary of Defense to use military jets to intervene in the hijacking of a commercial passenger jet. None of that was necessarily a smooth or rapid process.