Brain Game: In Motion

Thanks to the crowd of 100+ that attended the mental_floss challenge at the Mensa American Gathering yesterday evening at the Hyatt Regency in Dearborn. We met many fans there and hopefully earned some new ones too. Now, on to today's Brain Game:

What do the names of these NFL teams have in common?

Broncos, Chargers, Chiefs, Colts,
Eagles, Falcons, Jets, Patriots,
Raiders, Rams, Vikings