Original sentence: Despite it's open design it has been know to become one of the loudest stadiums in NFL, especially when Redskins play the Cowboys.FedExField has not had a football season in which the stadium failed to sell out its tickets
Edited sentence: <ref> Scarce Tactics Just how much demand is there for Skins tickets these days.Although the Redskins have never sold out the entire stadium, the team does not count "premium club level seating" when calculating sellouts.FedExField has not had a football season in which the stadium failed to sell out its non premium tickets