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!
To be fair, the Falcons were established in 1965, while the last time the Cards won an NFL championship was when Harry S. Truman was president