TUI AG is a tourism service provider operating globally, with a focus on hotels, resorts, tours, airlines, and cruise lines. TUI AG owns and operates hotels and resorts under several different brand names, including Robinson, Riu, TUI Blue, Blue Diamond, TUI Suneo, and TUI Magic Life. The company also operates tour operations and airlines businesses, and runs a fleet of approximately 150 aircraft and 15 cruise liners. TUI AG operates around 1,600 travel agencies and online portals, and owns approximately 400 hotels. Based in Hanover, Germany, the company was known as Preussag AG before changing its name to TUI AG in 2002.