Why is Sunday Night Football so big?

It’s all in the flex:

“To me what’s really worked phenomenally well over these past seven years is the flex scheduling, which over the last two years has put us in the position on the final night of the season two years ago to do Dallas against the Giants with the winner going to the playoffs and the loser done,” [Al] Michaels said.

Via So what is it that makes ‘Sunday Night Football’ the biggest attraction in primetime TV? @ SportsDay Blog.