A middle-aged man bought a one-way plane ticket to Seattle with a cash transaction and disappeared when he got off the plane. He literally disappeared and has not been traced since 1971.

On 24 November 1971, dressed in a suit and carrying a black bag, he went to Portland International Airport in the USA and bought a one-way ticket to Seattle. The man who bought the ticket with cash said his name was 'Dan Cooper'. He took his seat in seat 18C on a Boeing 727 aircraft.

The plane took off on time. Cooper handed a note to one of the stewardesses. The stewardess was not interested because she thought Cooper was writing a note to hit on her. When Cooper saw this, he said to the stewardess again, "Madam, you'd better look at the note; I have a bomb with me."

Cooper, noticing the slight alarm in the stewardess, showed the bomb in his bag to the stewardess and asked her to pass the note to the pilot. The stewardess immediately took the note to the pilot.

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