It's the only unsolved hijacking case in the history of commercial aviation. On the afternoon of November 24, 1971—Thanksgiving Eve—a man boarded a flight from Portland to Seattle and slipped a note to a flight attendant. He threatened to detonate a bomb if he didn't receive a hefty ransom. Once he got the money, the hijacker released all passengers and ordered the crew to fly to Mexico. Mid-air, with cash in hand, the man jumped from the aircraft, deploying a parachute into the pitch-black sky.
This man has come to be known as D.B. Cooper, and after a 45-year FBI investigation, his identity, whereabouts, and motive remain unknown.