Like the missing Malaysia Airlines flight, these planes vanished and their wreckage wasn’t found for a long time — and in some cases, was never found.
Amelia Earhart ,1937Amelia Earhart was the first female pilot to fly solo across the Atlantic Ocean. Earhart planned to fly around the world, and Lockheed specifically built a twin-engine monoplane based on her specifications. In 1937, she took off on a Lockheed Electra plane and her plane was lost over the Pacific. Neither Earhart nor any wreckage of the plane was ever found.AP