In 1971,who hijacked an aeroplane, collected a ransom, parachuted out over the Rocky Mountains and was never seen again?

Question

Initially family pressure sent Igor Stravinsky (1882-1971), later seen as among the most important and influential composers of the 20th century, to study what?

Answer 1

D B Cooper
The man bought his airline ticket as "Dan Cooper" but was never actually identified. News media called him D.B.Cooper. He has never been confirmed as found, and still remains unidentified.