“D.B. Cooper”
In 1971, a man traveling under the alias “Dan Cooper” managed to hijack a Boeing 727. He demanded a $200,000 ransom, received it and then lept from the plane in a parachute. He was never seen again. There is no evidence about his true identity but the FBI stated it is highly unlikely he survived the jump.
Amelia Earhart
For years and years, everyone believed Amelia Earhart died in a plane crash. She and her plane vanished over the Pacific Ocean in 1937 while she was trying to circumnavigate the globe. Turns out that is not what happened. A newly discovered photograph proves she was actually captured by the Japanese. Any further details are still a mystery.