How did Howard Hughes make his fortune?

It seems there are no specific clips available on how Howard Hughes made his fortune in the current data. However, generally, Howard Hughes was a billionaire whose wealth came from multiple sources:

1. Inheritance: Hughes inherited a substantial amount of money from his father's successful oil tool company, Hughes Tool Company.
2. Aviation: He expanded his fortune through significant investments in aviation, including founding Hughes Aircraft and several other aviation ventures that contributed to his wealth and influence in the aerospace industry.
3. Hollywood: Hughes was also a prominent film producer and director, investing in and producing successful Hollywood films, which added to his financial empire.
4. Real Estate: Over time, he accumulated substantial holdings in real estate and other industries, diversifying his sources of income.

If further detailed information is required, consulting a dedicated biography or documentary about Howard Hughes would be beneficial.