When the NFL and AFL merged in 1970, there were 26 teams. Of those franchises, what’s the only team that is undefeated against one of the others?
The Eagles are 9-0 vs. Jets; barring a Super Bowl, those teams won’t meet again until 2015.
The Patriots are 5-0 vs. Jacksonville, but the Jaguars didn’t join the league until 1995 and have beaten New England in the postseason.
Jets are 5-0 vs. Texans and the Texans are 6-0 vs. Dolphins, but Houston didn’t join the league until 2002.