Buffalo Bills
no team in the NFL this season is undefeated but the colts and the saints were but lost a couple of games
Detroit Lions
Oakland raiders
The Lions
Winning 8 straight games will do it.
Pittsburgh steelers
ATL son . that's straight
Chicago bears From 1933, when the first NFL championship game was played, to 2008, when Super Bowl XLII was played, the team that has lost the most NFL championship games is the New York Giants who have lost 11 NFL championship games (pre Super Bowl) and 1 Super Bowl for a total of 12.
denver broncos
As of the start of the 2008 season, the Arizona Cardinals are the only franchise in the NFL to have lost 600+ games.
Detroit Lions