Not a team logo, but the official logo of the old American Football League, which existed for 10 seasons between 1960 and 1969, before merging with the established National Football League. The newly merged league began play in 1970 with the original NFL teams (minus Pittsburgh, Cleveland and the Baltimore Colts) making up the National Conference, and the AFL clubs, plus the 3 NFL teams that agreed to the move, forming the American Conference. The merger helped grow the league into the monster it is today – the most popular spectator sport in the country.