Radisson Blu (formerly Radisson SAS) is an upscale international chain of full service hotels and resorts brand for Radisson Hotels mostly outside the United States, including those in Europe, Africa, and Asia. These are operated by Carlson Rezidor Hotel Group. As of December 2014, Radisson Blu has 287 hotels operating throughout the world with 68,270 rooms, and 102 hotels under development with an additional 23,489 rooms. Scandinavian Airlines System (SAS) used to be a major shareholder in Rezidor Hotel Group and licensed its brand for Radisson SAS hotels. Following the withdrawal of SAS from the partnership in 2009, the name changed from Radisson SAS to Radisson Blu. The new brand is being introduced gradually across the portfolio. In 2012, Carlson Hotels and Rezidor Hotel Group combined to form Carlson Rezidor Hotel Group.