Additionally, the arrival of the Texans meant that the league could return to its pre-1999 scheduling format in which no team received a bye during the first three weeks or last seven weeks of the season. From 1999 to 2001, at least one team sat out each week (including the preseason) because of an odd number of teams in the league (this also happened in 1960, 1966, and other years wherein the league had an odd number of teams). It nearly became problematic during the previous season due to the September 11 attacks, since the San Diego Chargers had their bye week during that week and the league nearly outright canceled that week's slate of games.