On the afternoon of 24 November 1971 , a man claiming to be Dan Cooper arrived at Portland International Airport.The man boarded aflight to Sealttle. One the plane was in the air , he told one of the filght attendants that he was carryind a bomb. he asked for a ransom of US$200000 and four parachutes. When the plane landed in Seattle , the parachutes and money were brought onto the plane . Cooper allowed the other passengers to leave,and then told the pilot to take him to Mexico