He walked onto a plane with a name that wasn’t his, ordered a bourbon and 7-Up, handed over a note saying he had a bomb, took $200,000 in cash, four parachutes, and then—somewhere over the Pacific Northwest on a cold November night in 1971—stepped out the back of a Boeing 727 and vanished. No confirmed body. No confirmed parachute. No confirmed identity. The world knows him as D.B. Cooper —though he called himself Dan Cooper —and his hijacking of Northwest Orient Flight 305