For its first nine seasons, 1960 through 1968, the American Football League determined its champion via a single playoff game between the winners of its two divisions (although ties in the standings in 1963 (Eastern) and 1968 (Western) necessitated a tiebreaker divisional playoff game the week before).
In 1969, the tenth and final year of the independent ten-team AFL, a four-team playoff was held, with the second-place teams in each division traveling to play the winner of the other division in what were called the "Interdivisional" playoffs. These playoffs were not, and are not considered to have been, "wildcard" playoffs since the runners-up in both divisions qualified, rather than the two best non-division winners. (Had the 1969 playoffs been true wildcard playoffs, the Western's third-place team, San Diego (8–6–0), would have qualified while the Eastern's runner-up, Houston (6–6–2), would not have.) The 1969 AFL playoffs were only the second time a U.S. major professional football league allowed teams other than the first place teams (including ties) to compete in post-season playoffs (the first was the seven-team All-America Football Conference's 1949 four-team playoff).
Prior to the advent of the Super Bowl for the 1966 season, the AFL went to great lengths to avoid scheduling its playoffs head-to-head with the NFL. In 1960, the NFL's game was held on Monday, December 26; the AFL had that week off, and played its title contest on Sunday, January 1, as the college bowl games were played on Monday. In 1961 and 1962, the AFL played its game during the off-week between the end of the NFL's regular season and its title game (thus resulting in the AFL holding championship games on December 24, 1961, and December 23, 1962, a week before the NFL's games of December 31, 1961, and December 30, 1962). In 1963, the AFL held its Eastern Division tiebreaker playoff on Saturday, December 28, 1963, thereby avoiding the NFL championship game that Sunday (the AFL championship game was held on January 5). In 1964, pro football had a championship weekend, with the AFL's title game held on Saturday, December 26, and the NFL championship on Sunday. For 1965, the AFL tried to return to the practice of playing its game on a Sunday during the off-week between the NFL playoff, slating its championship contest for December 26, while the NFL's game was not held until January 2, 1966; the Colts and Packers required a Western Conference tiebreaker on the December 26, date --- and since that game went to overtime, the TV audience for the Bills–Chargers title game in San Diego was diminished considerably. Even in 1966, the AFL originally scheduled its championship game for the off-week, planning to hold its playoff on Monday, December 26, six days before the NFL title game on January 1.
Negotiations prior to the first Super Bowl, in early December 1966, resulted in the two leagues agreeing to have championship doubleheaders for the next four years, with each holding its title game on the same day but staggered, so that television audiences could view both. Thus the final four AFL championship games were held on the same day as the NFL championship game: January 1, 1967; December 31, 1967; December 29, 1968; and January 4, 1970.
The Pro Football Hall of Fame and the National Football League include AFL playoffs in their statistics for the NFL playoffs.