D. B. Cooper
On 24 November 1971 a man calling himself Dan Cooper hijacked Northwest Orient Flight 305 between Portland and Seattle, took a $200,000 ransom, and parachuted from the plane at night over south-west Washington. He was never found.
1971 CE · 45.95, -122.55 · status: unexplained
The account
The FBI's search, code-named NORJAK, was the agency's longest-running unsolved hijacking file until it was closed as an active case in 2016. In 1980 a boy found $5,800 of the ransom notes, matching by serial number, on Tena Bar on the Columbia River near Vancouver, Washington. No body, parachute or other trace has been confirmed.
The sceptical view
The FBI long thought Cooper probably died in the jump, at night, in rain, over forest, with no suitable gear. Nothing about the case is paranormal; it belongs here as the region's most famous vanishing.