premise: Once a hijacking is confirmed the Pentagon 's National Military Command Center ( NMCC ) is supposed to be notified so they can order a military escort aircraft to follow the flight and report on anything suspicious , this did n't occur on 911 . 
hypothesis: If a hijack was confirmed , procedures called for the hijack coordinator on duty to contact the Pentagon 's National Military Command Center ( NMCC ) and to ask for a military escort aircraft to follow the flight , report anything unusual , and aid search and rescue in the event of an emergency .