The biggest tour bus company is City Sightseeing, which operates worldwide, as does Gray Line Worldwide. Large coaches are used in used in North America for tour operators for short and long distant destinations. These buses are larger than regular transit buses with 2 to 3 axles (4 to 6 wheels). These buses are used by tour operators, intecity bus lines and charters. Many musicians, entertainers, dancing crews and bands travel in "tour buses".