The two networks that hold the rights to broadcast NFL games on Sunday afternoons – Fox and CBS – both typically air doubleheaders during the regular season (with the other network only being permitted to broadcast one game in a specific market; each network is given eight doubleheaders to broadcast during the season, and both networks are given doubleheaders during the final week of the season in order for games with playoff implications to have the most exposure), with restrictions applying to some markets in which the local team is playing at home that week. When combined with the Sunday night game on NBC, this creates a tripleheader (as was sometimes advertised by the league's radio partner, Westwood One, which carried three games in a tripleheader format).