One of the cool stories about Hughes, is that in the late 1920's he decided he'd produce a movie and show Hollywood how it's done. The movie was called: "Hell's Angels," and although he liked the finished product, he heard that some movies were going to come out with sound. The first movie with sound, was launched by Warner Brothers in 1927 and was called: "The Jazz Singer." He loved it, then when he watched his film again (without sound), he found it to be too boring. So what does Hughes do? He couldn't stand not being the best. So he reshoots the entire movie and adds sound. The end result? He did it. It became the highest grossing movie of his time! It didn't hurt that he had Jean Harlow anchoring the film.
By the way, he manufactured so many planes for his movie and just general interests in flying, that by the time he finished, he had the third largest fleet of aircraft in the world and this includes various militaries around the world. Lastly, for your trivia pleasure, he worked for American Airlines incognito in 1932, as a baggage handler (he went by the name Charles Howard), so he could take their pilot training program. Once again, there's been no one like Howard.