On Thanksgiving Eve, November 24th, 1971, a smartly dressed man with a black briefcase and black wrap-around sunglasses arrived at Portland International Airport and booked a one-way flight to Seattle Washington, under the name of Dan Cooper on Flight 305 with Northwest Orient Airlines. In the sensationalism that followed the flight, his name became DB Cooper in the press. Cooper sat in seat 18E, the middle seat of the back…