The 1984 San Francisco 49ers went 15-1 in the regular season and wound up winning Super Bowl XIX to finish the season with an 18-1 record.
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The 1985 Chicago Bears and the 2007 New England Patriots also won 18 games in a single season.
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The Patriots are the ONLY team to be perfect in the regular and post season's and lose the superbowl They went 16-0 then won their 2 playoff games then lost the Super Bowl
As of the 2008 season: 1984 San Francisco 49ers, winners of Super Bowl XIX.
1985 Chicago Bears, winners of Super Bowl XX.
2007 New England Patriots, losers of Super Bowl XLII.
No NFL teams have no cheerleaders. They all have them and many of them.
The Detroit lions went 0-16 in the 2008 season.
32 teams
Through Super Bowl XLIV, 1, the 2001 New England Patriots that defeated the St. Louis Rams in Super Bowl XXXVI.
In the 2008 season the patriots lost to the dolphins,chargers,colts,jets,steelers and patriots went 11-5 in that season
No NFL teams went undefeated in 2009.
Pittsburg, Baltimore and Cleveland
5
The Dallas Cowboys, along with the rest of the NFL teams, went on strike in the 1987 NFL season. In addition, the Cowboys (and the other NFL teams) went on strike during the 1983 season. There were no "replacement" games in 1983 unlike 1987.
Colts & Saints
No nfl teams are playing today
32 NFL football teams
Click on the 'The NFL in 1950' link on this page to see the teams and rosters of the teams that were in the NFL in 1950.
In the NFL their are 32 teams
17-0 Miami Dolphins 18-0 Patriots
Detroit Lions went 0-16 in 2008
No NFL teams have no cheerleaders. They all have them and many of them.