On 24 November 1971, a passenger sitting alone in seat 18C on Flight 305 from Portland, OR to Seattle, WA passed a note to Florence Schaffner, a flight attendant on board that Northwest Orient airline.  Schaffner, at first dismissing the note as another attempt by a passenger to court her, reluctantly read it after the passengers insistence.  The note stated he had a bomb and would blow up the plane unless he received $200,000 in  cash, 4 parachutes and the flight crews cooperation.  Scaffner looked into the mans small black suitcase and…