D. B. Cooper
Dan Cooper is the pseudonym of an unidentified man who hijacked a Boeing 727 aircraft in the northwest United States, in the airspace between Portland, Oregon, and Seattle, Washington, on the afternoon of Wednesday, November 24, 1971. The man purchased his airline ticket using the alias Dan Cooper but, because of a news miscommunication, became known in popular lore as D. B. Cooper. He extorted $200,000 in ransom (equivalent to $1,260,000 in 2019) and parachuted to an uncertain fate. Despite an extensive manhunt and protracted FBI investigation, the perpetrator has never been located or identified. It remains the only unsolved case of air piracy in commercial aviation history.
Many FBI agents are of the opinion that Cooper probably did not survive his high-risk jump, but his remains have never been recovered. The FBI maintained an active investigation for 45 years after the hijacking. Despite a case file that has grown to over 60 volumes over that period, no definitive conclusions have been reached regarding Cooper's true identity or whereabouts.
Numerous theories of widely varying plausibility have been proposed over the years by investigators, reporters, and amateur enthusiasts. A young boy discovered a small cache of ransom bills along the banks of the Columbia River in February 1980. The find triggered renewed interest but ultimately only deepened the mystery, and the great majority of the ransom remains unrecovered.
The FBI officially suspended active investigation of the case in July 2016, but the agency continues to request that any physical evidence that might emerge related to the parachutes or the ransom money be submitted for analysis.
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References:
https://en.wikipedia.org/wiki/D._B._Cooper
https://news.google.com/newspapers?id=vuVNAAAAIBAJ&pg=6384%2C3320413
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