Let’s start with the most infamous. On November 24, 1971, a man hijacked a plane flying between Portland, OR and Seattle, WA. Telling everyone he had a bomb, he demanded $200,000, 4 parachutes, and a fuel truck in Seattle. After landing and letting the passengers go, the plane took off again.

Once back in the air, Cooper put on the parachute, opened a door and jumped out of the plane with his ransom, never to be seen again. Some of the money was recovered in 1980, but the bulk of it was still awol.

The FBI investigated the case without success until 2016, when they suspended the case. In that time, there’re been several theories, but for the most part, the case of D.B. Cooper remains inconclusive and unsolved.