Here's a full history of the NFL on Christmas. For years, the NFL season simply did not run long enough to reach the holiday. Until the AFL-NFL merger in 1970, the regular season ended in mid-December ...

It's an amazing run of consistent relevance. The streak bridges the three coaches the Steelers have had since 1969. Chuck Noll coached from 1989 through 1991. Bill Cowher, from 1992 through 2006.