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Watch History's Greatest Mysteries Season 4 Episode 14 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

It's the only unsolved air piracy case in history. In 1971, a man hijacks a Northwest Orient Airlines flight, demanding 4 parachutes and $200,000. He jumps out of the plane with the money and is never seen again. Can new evidence finally reveal the identity of the anonymous hijacker known as D.B. Cooper?