American football in the United States the Fall Experimental Football League played two seasons in 2014 and 2015). Two professional football leagues are pending launch: the Alliance of American Football is scheduled to debut in February 2019, while the XFL, a revamp of a league of the same name that played one season in 2001, is set to return in February 2020. There are several professional indoor football leagues, played at basketball-sized arenas. The oldest one is the Arena Football League, which had several teams co-owned by several NFL owners but is officially independent from the NFL. Indoor football leagues play by significantly different rules that
American football in the United States American football in the United States American football is the most popular sport in the United States. The National Football League has the highest average attendance of any sports league in the world. In the United States the game is most often referred to as simply "football". There is no single national governing body for American football in the United States or a continental governing body for North America. There is an international governing body, the International Federation of American Football, or IFAF. Befitting its status as a popular sport, football is played in leagues of different size, age and