Question: The winner of Super Bowl XXXIX equaled a record set by which 1978 NFL team?

The Dallas Cowboys are a professional American football team based in the Dallas–Fort Worth metroplex.  The Cowboys compete in the National Football League (NFL) as a member club of the league's National Football Conference (NFC) East division.  The team is headquartered in Frisco, Texas, and plays its home games at AT&T Stadium in Arlington, Texas, which opened for the 2009 season.  The stadium took its current name prior to the 2013 season.  The Cowboys joined the NFL as an expansion team in .  The team's national following might best be represented by its NFL record of consecutive sell-outs.  The Cowboys' streak of 190 consecutive sold-out regular and post-season games (home and away) began in 2002.  The franchise has made it to the Super Bowl eight times, tied with the Pittsburgh Steelers, and the Denver Broncos for second most Super Bowl appearances in history, just behind the New England Patriots record nine Super Bowl appearances.  This has also corresponded to eight NFC championships, most in the NFC.  The Cowboys have won five of those Super Bowl appearances, tying them with their NFC rivals, the San Francisco 49ers, and the AFC's Patriots; all three are second to Pittsburgh's record six Super Bowl championships.  The Cowboys are the only NFL team to record 20 straight winning seasons (1966–85), in which they only missed the playoffs twice (1974 and 1984), an NFL record that remains unchallenged. <SEP> Freddie Lee Mitchell Jr. (born November 28, 1978) is a former American football wide receiver who played for the Philadelphia Eagles of the National Football League (NFL) for four seasons.  He was chosen as a consensus All-American in 2000 while playing college football for the University of California, Los Angeles (UCLA).  The Philadelphia Eagles selected him in the first round of the 2001 NFL Draft, and he spent four seasons as a member of the Eagles, culminating in an appearance in Super Bowl XXXIX following the 2004 NFL season. <SEP>  They finished with their second straight 14–2 record before advancing to and winning Super Bowl XXXIX, their third Super Bowl victory in four years. The 2004 New England Patriots season was the 35th season for the team in the National Football League and 45th season overall.  They are, as of the present, the last team to repeat as World Champions. <SEP> The 1978 Miami Dolphins season saw the team return to the NFL playoffs for the first time since 1974, with an 11–5 record.  Quarterback Bob Griese missed the first seven games due to a knee injury.  The Dolphins got off to a 5-2 start behind back-up Don Strock.  Upon Griese's return the Dolphins earned a birth to the playoffs as a Wild Card.  Helping to lead the Dolphins back to the postseason was Running Back Delvin Williams who set a team record with 1,258 yards rushing on the season.  In the first playoff game involving two Wild Cards the Dolphins were stunned 17-9 by the Houston Oilers at the Orange Bowl.  In the process the Dolphins set two notable records: scoring first in all but one of their sixteen regular season games, and never trailing at any point in eleven games.  The former record was equalled by the 2004 Patriots, and the latter was beaten by the 2005 Colts.