Professional teams in all major sports in the United States operate as franchises within a league, meaning that a team may move to a different city if the team's owners believe there would be a financial benefit, but franchise moves are usually subject to some form of league-level approval. All major sports leagues use a similar type of regular-season schedule with a post-season playoff tournament. In addition to the major league–level organizations, several sports also have professional minor leagues, active in smaller cities across the country. As in Canada and Australia, sports leagues in the United States do not practice promotion and relegation, unlike most sports leagues in Europe.