The last words you want to hear on a plane is, "I have a bomb." But for the flight attendants on board Northwest Orient Airlines 305, those are the exact words spoken to them the night before Thanksgiving in 1971. The elaborate and unusual hijacking that ensued would elude the FBI for over 50 years, and and become one of the world's most fascinating mysteries. Who is D.B. Cooper? Why did he hijack this plane? Did he even survive his own hijacking? We'll tell the story of this legendary hijacking, and explore the potential answers to all of these questions on our series on the infamous D.B. Cooper.