After WWI, the US Government had an abundance of biplanes that were sold very cheaply. Anyone could buy them because there were no aviation regulations.
They would advertise the show and perform at local farms creating the name.
At first they offered rides and later employed stunt people to walk wings and perform other stunts.
Many minorities and women were able to make a lot of money doing it.
Due to emerging aviation regulations, Barnstorming eventually lost popularity.