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November 24, 1971 - A man using the assumed name of 'Dan Cooper' leaped from the aft stairwell of a Boeing 727 jetliner after demanding four parachutes and $200,000 in cash. He was never seen again, and four decades later, he has never been identified - until now. Kenneth Peter Christiansen, a former World War II paratrooper and later a purser for Northwest Airlines, was the man who pulled off one of the boldest unsolved crimes in history. Skipp Porteous of Sherlock Investigations, New York, and Robert Blevins of Adventure Books of Seattle present the case that Christiansen and Cooper were one and the same. This specially revised edition of the book takes into account new information discovered about Christiansen since the original release. Additional photos, new witness testimony, and a chapter on how the History Channel became involved have been added.