The Denver Broncos are a professional American football franchise based in Denver, Colorado. The Broncos compete as a member club of the National Football League's American Football Conference West division. They began play in 1960 as a charter member of the American Football League and joined the NFL as part of the merger in 1970. The Broncos are owned by the Pat Bowlen trust and currently play home games at Broncos Stadium at Mile High. Prior to that, they played at Mile High Stadium from 1960 to 2000. The Broncos were barely competitive during their 10-year run in the AFL and their first seven years in the NFL. They did not complete a winning season until 1973. In 1977, four years later, they qualified for the playoffs for the first time in franchise history and advanced to Super Bowl XII. Since 1975, the Broncos have become one of the NFL's most successful teams, having suffered only seven losing seasons. They have won eight AFC Championships, and three Super Bowl championships, and share the NFL record for most Super Bowl losses.