From the foundation of the American Association (AA) in 1902 through its final season in 1997, its pitchers threw 97 no-hitters, which include 6 perfect games. Of these no-hitters, 72 were pitched in games that lasted at least the full 9 innings, while 25 were pitched in games shortened due to weather or that were played in doubleheaders, which were typically 7 innings. Only three of the league's six perfect games were tossed in full nine-inning games. Five no-hitters were combined—thrown by two or more pitchers on the same team.