AIF meaning in Sports ?

American Indoor Football (AIF) was a professional indoor football league, one of the several regional professional indoor football leagues in North America.

The AIFL began as a regional league with six franchises on the East Coast of the United States in 2005. After a rapid, and largely failed, expansion effort in 2006, most of the league's remaining teams jumped to the new AIFA (the rest joined the short-lived WIFL). The AIFA expanded throughout existing territory and, in 2008, expanded into the Western United States. The league legally divided into two entities to allow for a partial merger with the Southern Indoor Football League, which resulted in all of its Eastern teams merging into the SIFL and the AIFA only maintaining its western teams. The league's western component, which remained separate of the merger, had indicated it would play as the AIFA West for the 2011 season but ceased operations January 2011. The league announced it would be relaunching as American Indoor Football in time for spring 2012.

After the 2016 season, the AIF ceased operations with the former AIF owner stating his support for the recently created Arena Developmental League. In 2021, league owner John Morris announced he planned to relaunch the AIF for the 2022 season.