Six Flags Entertainment Corp. is the world's largest amusement park corporation based on number of properties, and the fifth-most popular in terms of attendance. The company maintains 18 properties throughout North America consisting of theme parks, thrill parks, water parks, and family entertainment centers. In 2009, Six Flags properties hosted 23.9 million guests. The company has almost-exclusive rights to the Looney Tunes characters and has used them in many of their parks, both currently and formerly.