In 1966, the success of the rival AFL, the spectre of the NFL's losing more stars to the AFL, and concern over a costly "bidding war" for players precipitated by the NFL's Giants' signing of Pete Gogolak, who was under contract to the AFL's Buffalo Bills, led the two leagues to discuss a merger. Pivotal to this was approval by Congress of a law (PL 89-800) that would waive jeopardy to anti-trust statutes for the merged leagues. The major point of the testimony given by the leagues to obtain the law was that if the merger were permitted, "Professional football operations will be preserved in the 23 cities and 25 stadiums where such operations are presently being conducted." The merger was announced on June 8, 1966, and became fully effective in 1970.After expanding to enfranchise the New Orleans Saints in 1967, the NFL split its 16 teams into two conferences with two divisions each: the Capitol and Century Divisions in the Eastern Conference, and the Coastal and Central Divisions in the Western Conference. The playoff format was expanded from a single championship game to a four-team tournament, with the four divisional champions participating. The two division winners in each conference met in the "Conference Championships," with the winners advancing to the NFL Championship Game. Again, the home team for each playoff game was determined by a yearly divisional or conference rotation.The AFL on the other hand, raised its total franchise number to nine in 1966 with the Miami Dolphins, joining the Eastern Division and a tenth team, the Cincinnati Bengals in 1968. The league kept using the one-game-playoff format except when division tie-breakers were needed. With the addition of the Bengals to the Western Division in 1969, the AFL adopted a four-team playoff to determine its champion.
Following the NFL and AFL Championship Games for the 1966 through 1969 seasons, the NFL champion played the AFL champion in Super Bowls I through IV, the only true inter-league championship games in the history of professional football. The first two of these games were known as the AFL-NFL World Championship Game, as the title Super Bowl was not chosen until 1968. Thus the third AFL-NFL matchup was dubbed "Super Bowl III" and the first two matches were retronamed as Super Bowls I and II. The first two games were convincingly won by the NFL's Packers, the last two by the AFL's New York Jets and Kansas City Chiefs, leaving the leagues even at 2-2 in "World Championship" competition when they subsequently merged.
All participants in those four AFL-NFL championship games were either AFL champions or NFL champions in the record books, no matter the outcome of the Super Bowl. Three of the four league champions who lost one of the first four Super Bowls would eventually win at least one. The exception, as of 2007, is the Minnesota Vikings.
Following the NFL and AFL Championship Games for the 1966 through 1969 seasons, the NFL champion played the AFL champion in Super Bowls I through IV, the only true inter-league championship games in the history of professional football. The first two of these games were known as the AFL-NFL World Championship Game, as the title Super Bowl was not chosen until 1968. Thus the third AFL-NFL matchup was dubbed "Super Bowl III" and the first two matches were retronamed as Super Bowls I and II. The first two games were convincingly won by the NFL's Packers, the last two by the AFL's New York Jets and Kansas City Chiefs, leaving the leagues even at 2-2 in "World Championship" competition when they subsequently merged.
All participants in those four AFL-NFL championship games were either AFL champions or NFL champions in the record books, no matter the outcome of the Super Bowl. Three of the four league champions who lost one of the first four Super Bowls would eventually win at least one. The exception, as of 2007, is the Minnesota Vikings.
1970 – present: The Super Bowl era
Post Merger
After the 1969 season and Super Bowl IV, the AFL and NFL fully merged and underwent a re-alignment for the 1970 season. Three of the pre-merger NFL teams were transferred to the AFC (Browns, Colts, and Steelers) to level the conferences (AFC and NFC) at 13 teams each; each conference split into three divisions. Since there was now only one league, the Super Bowl became a league championship and the winner is the NFL champion.
With only six division winners in the newly merged league, the NFL designed an eight-team playoff tournament, with four clubs from each conference qualifying. Along with the three division winners in each conference, two wild card teams (one from each conference), the second-place finishers with the best records in each conference, were added to the tournament. The first round was named the "Divisional Playoffs", with the winners advancing to the "Conference Championships" (AFC & NFC). Two weeks later, the AFC and NFC champions met in the Super Bowl, now the league's championship game. Thus, Super Bowl V in January 1971 was the first Super Bowl played for the NFL title.With the introduction of the wild card, a rule was instituted to prohibit two teams from the same division (champion and wild card) from meeting in the first-round (Divisional Playoffs). This rule would remain in effect through the 1989 season. More significantly, the home teams in the playoffs were still decided by a yearly divisional rotation, not on regular-season records (excluding the wild-card teams, who would always play on the road). This lack of "home-field advantage" was most evident in the 1972 playoffs, when the undefeated Miami Dolphins played the AFC Championship Game against the Pittsburgh Steelers, who had recorded three losses during the regular season, at Three Rivers Stadium in Pittsburgh.Beginning in 1972, tie games were included in the computing of each team's winning percentage. Each tie was now counted as half of a win and half of a loss, rather than omitted from the computation.