Scandinavian Airlines, usually known as SAS, is the flag carrier of Denmark, Norway and Sweden. SAS is an abbreviation of the company's full name, Scandinavian Airlines System or legally Scandinavian Airlines System Denmark-Norway-Sweden. Part of the SAS Group and headquartered at the SAS Frösundavik Office Building in Solna, Sweden, the airline operates 180 aircraft to 90 destinations. The airline's main hub is at Copenhagen-Kastrup Airport, with connections to 109 destinations around the world. Stockholm-Arlanda Airport is the second largest hub and Oslo Airport, Gardermoen being the third major hub of SAS. Minor hubs also exist at Bergen Airport, Flesland, Göteborg Landvetter Airport, Stavanger Airport, Sola, and Trondheim Airport, Værnes. SAS Cargo is an independent, wholly owned subsidiary of Scandinavian Airlines and its main office is at Copenhagen Airport.