 In the early years of the sport, teams often "barnstormed", and played squads from leagues outside their own, or against local college teams or other amateur groups, charging fans whatever the traffic would bear.When the NFL was founded in 1920, all games counted in the standings and would be used to determine the league champion.In 1921, this was revised to only count games involving two league members, thus allowing non-league exhibitions, but effectively banning exhibitions between two league teams.