The hijacking was one of the most famous unsolved cases in all of u.s history, and it was all done by one man named: D.B Cooper. He had bought a plane ticket on November 24th 1971 paying only in cash, he had bought a plane ticket bound for Seattle, Washington. Cooper was a quiet man who appeared to be in his mid-40s, wearing a business suit with a black tie and white shirt. a short time after 3:00 P.M., he handed the stewardess a note indicating that he a bomb in his briefcase and wanted her to sit with him

The stunned stewardess did as she was told. Opening a cheap attache case, cooper showed her a glimpse of a mass of wires and red colored sticks and demanded that she write down what he told her.

Soon, She was walking a new note to the captain of the plane a demanded four parachutes and 200,000 in twenty-dollar bills.

When the flight landed in Seattle, the hijacker exchanged the flight’s 36 passengers for the money and parachutes. Cooper kept several crew members, and the plane took off again, ordered to set a course for Mexico City. Somewhere between Seattle and Reno, a little after 8:00 p.m., the hijacker did the incredible: he jumped out, the back of the plane with a parachute and the ransom money.. and more than 50 years later the infamous crime may have been solved, after a pair of siblings came forward to claim they had found the parachute used in the hijacking, in their mother’s shed, and that Cooper was their father. Chante and Rick McCoy the 3rd say their father Richard McCoy Jr, was the man who identified himself as Dan Cooper when he boarded the NorthWest Orient Airlines jetliner from portland to Seattle in November 1971. Cooper, Or perhaps McCoy, proceeded to order a bourbon and a soda before handing a note to a flight attendant that said he had a bomb in his brief case.

sources: https://www.dailymail.co.uk/news/article-14118185/db-cooper-case-possibly-cracked-bombshell-new-clue.html

https://www.fbi.gov/history/famous-cases/db-cooper-hijacking