Mentioned but never seen. Was described as "an odd case, even by Warehouse standards."
In 1971, D. B. Cooper hijacked an aircraft over Washingon state and got away with $200,000 in ransom money before parachuting out of the plane. He was never caught nor convicted, nobody even knows his real name because he bought his ticket under the fake name Dan Cooper. This case remains the only air piracy case in American aviation history.