Where does the phrase barnstorming come from?

Barnstorming earned its name from the aerobatic pilots who would land their light planes in fields and use local barns as venues for their impromptu airshows. Paying spectators would gather to watch these daring pilots attempt a variety of dangerous tricks.

What was the purpose of Barnstormer teams?

Many of the Negro League teams made barnstorming tours during the regular season. In the beginning the Negro Leagues were organized very loosely. The schedules were irregular and gave the teams the opportunity to travel around the country to earn some extra money.