D.B. Cooper is the alias of an unidentified individual who, in 1971, hijacked a commercial airplane in the United States. He extorted $200,000 in ransom and then parachuted out of the plane, disappearing without a trace. Despite extensive investigations by the FBI, Cooper's identity and fate remain a mystery, making it one of the most famous unsolved cases in American criminal history. The case has inspired numerous theories and cultural references, including books, documentaries, and films. Over the years, various suspects have been proposed, but none have been definitively linked to the crime. The enduring intrigue surrounding D.B. Cooper continues to captivate the public and researchers alike.