The Oklahoma City Thunder are a professional basketball franchise based in Oklahoma City, Oklahoma. They play in the Northwest Division of the Western Conference in the National Basketball Association (NBA) with their home arena at Oklahoma City's Ford Center. The Thunder's NBA Development League affiliate is the Tulsa 66ers, which it also owns. Formerly the Seattle SuperSonics, the Thunder was established in 2008 after a dispute between owner Clay Bennett and lawmakers in Seattle, Washington. While still located in Seattle, the club qualified for the NBA Playoffs 22 times, won its division six times and won the 1979 NBA Championship. In the franchise's first season in Oklahoma, the Thunder went 23¿59 (.280).