For a little more than 60 years, from 1904 to 1967, St. Louis was considered the world's air capital for balloon racers, parachutists, airship aeronauts, air-traffic controllers, scheduled airlines, solo-flight adventurers, fighter pilots, and astronauts. At many times, the United States has led the world in aviation development and technology, and St. Louis was one of the biggest contributors with many aviation firsts. A U.S. president first flew...