the Pittsburgh Steelers
The Cowboys of course.
Uh... A lot of teams.
The Dallas Cowboys went to the Super Bowl 8 times. The most in Super Bowl history. They are 5-3.
Dallas Cowboys, 8
Steelers and the Cowboys.
Tie between Dallas and Pittsburg
Buffalo Bills with 4 straight from Super Bowl XXV through XXVIII.
Arkansas is a college team and does not play in the NFL's Super Bowl.
The Dallas Cowboys and the Pittsburgh Steelers have been in the Super Bowl 8 times each. See link for details.
The quarterback that was on the most Super Bowl teams was backup Gale Gilbert. He was on the roster of the four Buffalo Bills teams that went to the Super Bowl (Super Bowls XXV through XXVIII) and the San Diego Chargers team that played in Super Bowl XXIX, a total of five Super Bowls. Incredibly, his team lost the Super Bowl each time.