Docuseries “D.B. Cooper: Where Are You?!” started streaming on Netflix on Wednesday. The latest unsolved mystery looks at the baffling case of D.B. Cooper.

Cooper hijacked a plane flying from Portland to Seattle in 1971 and demanded a $200,000 ransom before parachuting out over Washington.

The FBI spent over 45 years investigating the case. The unknown man, who booked the flight under the alias Dan Cooper, has never been caught by the FBI despite a 45-year investigation.

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On November 24 1971, the hijacker purchased his one-way ticket to Seattle from Portland and took a briefcase containing explosives onto the plane.

He passed a note to air hostess Florence Schaffner, claiming to have a bomb. In the instruction, he wrote: “I want $200,000 by 5:00 p.m. In cash. Put in a knapsack. I want two back parachutes and two front parachutes. When we land, I want a fuel truck ready to refuel. No funny stuff or I’ll do the job,” according to New York magazine.

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After landing in Seattle, Cooper was handed the ransom and the passengers were released. He then asked the captain to fly him to Mexico City. During the flight, he strapped the cash to himself and jumped out with the parachute above southwest Washington.

The FBI launched an investigation, which is when they discovered that the name Dan Cooper was fake. In 1980, $5,800 in bills was found on the Columbia River by an eight-year-old boy on holiday with his family, which hinted that Cooper’s parachute may have crashed in the location. The FBI identified the money from the ransom.

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Since the incident, the FBI looked into over 1,000 suspects who could be D.B. Cooper. However, no there has been no confirmation of his identity so far. FBI agents recovered 66 unidentified latent fingerprints aboard the airliner.

On July 8, 2016, the FBI announced that it was suspending active investigation of the Cooper case. They said that the investigative resources and manpower could be used on higher and more urgent priority.

The 66-volume case file compiled over the 45-year course of the investigation that will be preserved for historical purposes at FBI headquarters in Washington D.C.