<P> A perfect season may be part of a multi-season winning streak . </P> <P> Exhibition games are generally not counted toward standings, for or against . For example, the 1972 Miami Dolphins (below) lost three of their preseason ("exhibition" games in 1972 NFL vernacular) games but are considered to have had a perfect season . </P> <P> Since the National Football League began in 1920, only one team has played a complete perfect season (both regular season and playoffs): the 1972 Miami Dolphins, who won all fourteen of their regular season games and three postseason games, including Super Bowl VII, to finish the season 17--0--0 . </P> <P> The Dolphins briefly extended their winning streak before losing to the Oakland Raiders on September 23, 1973 . It has often been reported that the surviving members of the 1972 Dolphins would, every season, either gather to drink champagne when the final undefeated team earned its first loss of the year, or send a case of champagne to the team who beat this final undefeated team . The head coach of the 1972 Dolphins, Don Shula, denied this in a 2007 interview with ESPN . On August 20, 2013, four decades after their accomplishment, President Barack Obama hosted the 1972 Dolphins noting that they "never got their White House visit". </P>

What nfl team has the most wins in a season