The franchise is also the only NFL organization to win three consecutive championships .
NFL executed this twice : 1929 , 1930 and 1931 , plus 1965 , 1966 and 1967 .
The franchise is also the only NFL organization to win three consecutive championships , and they executed this twice : 1929 , 1930 and 1931 , plus 1965 , 1966 and 1967 .