Six Flags, Inc. is the largest regional theme park company in the world -- a national brand with regional focus. The company's 21 entertainment destinations in North America comprise theme, water and zoological parks. Last year, nearly 30 million guests spent a combined 250 million hours at Six Flags parks. Founded in 1961, they celebrated their 45th anniversary in 2006. Six Flags, Inc. is a publicly-traded corporation (NYSE: SIX) headquartered in New York City.