TUI AG is a global tourism company that provides a range of services to travelers worldwide. The company operates hotels and resorts under various brand names, such as Robinson, Riu, and TUI Blue. It is also involved in the tour operation and airlines businesses, operating a fleet of 1,600 travel agencies and online portals, 5 airlines with approximately 150 aircraft, and 15 cruise liners. The company also owns around 400 hotels. TUI AG was formerly known as Preussag AG and changed its name to TUI AG in June 2002. The company headquarters is in Hanover, Germany.