The most famous person to have ever disappeared in American history also may have never existed. A man calling himself D.B. Cooper hijacked a Boeing 727 traveling between Portland and Seattle on November 24, 1971. After he had the plane stop at Seattle-Tacoma airport to collect $200,000 in ransom and four parachutes, the alleged Cooper leapt from the plane over southwestern Washington, never to be seen again. Despite over 40 years of investigation and thousands of theories, no one has been able to locate D.B. Cooper or identify his real name.