The falcons were founded in 1966 and have never won a Super Bowl.
While the Cardinals, Lions, Titans, Chargers, Browns, Bills and Vikings are older and have never won a Super Bowl, all won at least one AFL or NFL title before the 1970 AFL-NFL merger.
Congrats Falcons!
These Browns are an expansion team. You’re thinking of the Ravens winning before the 70s,since you named the Titans by their modern name instead of the Oilers.