The National Football League was founded in 1920 under the name American Professional Football Association. The name was changed to National Football League in 1922.
The NFL was formed in 1920 as the American Professional Football Association (APFA) before renaming itself the National Football League for the 1923 season.(from Wikipedia (National Football League)
Carolina panthers
16 by the Detroit lions in 2008-2009 NFL season
No. Preseason statistics are never officially recognized.
Probably 2011, when the NFL season started before the end of the MLB season.
Twice - in 1982 and 1987. In both cases, part of the season was played.
Brett Favre retired from the National Football League after the 2010 season.
The New Orleans Saints' inaugural season in the National Football League was 1967.
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