Answer:
Zero Times The 2002 NFL Realignment brought with it a new Conference and Division setup, but it also ushered in the currently in use NFL schedule rotation which assures that all teams will face every other team at least once overy four years.
Among other schedule oddities that this 2002 scheduling policy erased, was a period between 1981 and 1999 where the Raiders and the Steelers had no regular season games scheduled against each other.
