 The Alliance of American Football (AAF), which folded before the end of its inaugural 2019 season, had several significant rule differences from other leagues.The AAF eliminated kickoffs.Possession at the start of each half, or after any offensive score, began on the "receiving" team's 25-yard line (the same point as the NFL then used after touchbacks on kickoffs), barring the "kicking" team choosing to attempt an "onside conversion".