TUI AG, together with its subsidiaries, provides tourism services worldwide. It operates hotels and resorts under the Robinson, Riu, TUI Blue, Blue Diamond, and TUI Magic Life brands. The company is also involved in the tour operation and airlines businesses. In addition, it operates cruise liners. The company operates a fleet of 1,600 travel agencies and online portals; 5 airlines with approximately 150 aircrafts; and 17 cruise liners, as well as approximately 400 hotels. The company was formerly known as Preussag AG and changed its name to TUI AG in June 2002. TUI AG is headquartered in Hanover, Germany.