To honor the AFL's tenth and final season, a special anniversary logo was designed and each Kansas City Chiefs player wore a patch on his jersey with the logo during Super Bowl IV, the final AFL-NFL World Championship Game prior to the AFL–NFL merger.
The Chiefs defeated the Oakland Raiders in the final AFL Championship Game, then soundly defeated the National Football League's Minnesota Vikings in Super Bowl IV.
In its final two years of existence the AFL had ten teams, grouped into two divisions. Each team played a home-and-away game against the other four teams in its division, a home-and-away series against one of the five teams in opposite division, and one game each against the remaining four teams from the opposite division. Using that format, the defending World Champion New York Jets went 10–0 against the five teams they played twice (i.e., their four weak divisional rivals plus last-place second-year Cincinnati) while going 0–4 against the top four teams in the West.
For the 1969 season, a provision was made for a four team playoff to determine the AFL Champion, the league's representative in the Super Bowl, with the #1 team in the division to play against the #2 team in the opposite division. The NFL also had a four team playoff, introduced in 1967, matching the winners of the Capitol and Century divisions, and the Coastal and Central divisions.
The 1970 merger placed the 10 AFL teams (along with 3 teams from the pre-1970 NFL) into the 13-team AFC. (The other NFL teams went into the 13-team NFC.)
In 1970, the AFL was absorbed into the NFL and the league reorganized with the ten AFL franchises along with three existing NFL teams: the Baltimore Colts, the Cleveland Browns, and the Pittsburgh Steelers, becoming part of the newly formed American Football Conference.
The AFL and the NFL champions faced each other in Super Bowl IV at the end of the season to determine an overall champion.
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