High school diploma
At the height of the Depression and still in high school, Albert Ueltschi opened a hamburger stand to earn money with the goal of learning to fly. Using the eatery as collateral, he bought a bi-wing airplane with $3,500 he borrowed. According to a profile in The Warren Buffett CEO: Secrets of the Berkshire Hathaway Managers
, a book by Robert P. Miles, Ueltschi sold rides, put on airshows, and eventually flew clients around the country. In 1951 he borrowed $15,000 to start FlightSafety International
, a company to train pilots. Ueltschi sold it to Warren Buffet for a reported $1.5 billion in 1996.