True, but the Vikings have 9 years on the Bills. They started in 1961, the Bills in 1970. They've both been in 4. The Bills infamously lost 4 in a row. 89-90-91-92
The Vikings last appearance was 1977, when they lost to the Raiders. 12 current NFL teams have never won: Arizona Cardinals, Atlanta Falcons, Buffalo Bills, Carolina Panthers, Cincinnati Bengals, Cleveland Browns, Detroit Lions, Houston Texans, Jacksonville Jaguars, Los Angeles Chargers, Minnesota Vikings, and Tennessee Titans.
Pretty sure the Browns & Lions won championships before it was called the Super Bowl.