The league that has been most impacted by blackouts is the NFL. It has a rule, written decades ago, when watching the games on television wasn’t as big as going to the stadium. Currently, if an NFL team does not sell out its game by Thursday, the local broadcast of its weekend game would be blacked out. The game could still be seen in other parts of the country. (The Redskins haven’t faced this situation in years since their games almost always sell out).