Guy jumps out of a plane... never seen from again

Back in 1971 a guy calling himself DB (Dan) Cooper got on a plane, showed an air hostess what appeared to be a bomb forced the plane to land in Seattle then demanded a $200,000 ransom with 4 parachutes. He then released 36 passengers on receipt of the money and parachutes. Next the plane was ordered to fly to Mexico.
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From FBI.gov:
Somewhere between Seattle and Reno, a little after 8:00 p.m., the hijacker did the incredible: he jumped out of the back of the plane with a parachute and the ransom money. The pilots landed safely, but Cooper had disappeared into the night and his ultimate fate remains a mystery to this day.
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He was never heard from again. In 1980 a young boy found several tattered $20 bills in the area presumably near where he jumped out of the plane. Now today new clues emerged.

Sources -> http://www.telegraph.co.uk/news/worldnews/northamerica/8916276/New-clues-in-DB-Cooper-hijacking-case-after-clip-on-tie-discovery.html via http://www.thehighdefinite.com/2011/11/the-d-b-cooper-mystery-an-illustrated-guide/
http://www.fbi.gov/news/stories/2006/november/dbcooper_112406
http://articles.cnn.com/2011-08-01/justice/fbi.db.cooper_1_fbi-spokesman-dan-cooper-flight-attendant/2?_s=PM:CRIME
http://okietreasurehunter.blogspot.com/2011/01/history-of-db-cooper.html