Turkish Airlines (Turkish: Türk Hava Yolları) (İMKB: THYAO) is the national flag carrier airline of Turkey, headquartered at the Turkish Airlines General Management Building on the grounds of Atatürk Airport in Yeşilköy, Bakırköy, Istanbul.[3][4] It operates scheduled services to 163 international and 41 domestic cities (38 domestic airports), serving a total of 204 airports, in Europe, Asia, Africa, and the Americas. With an increase to 91 destination countries, the carrier's destination network from one hub is the world's largest.[5] The airline's main base is at Atatürk International Airport, with secondary hubs at Esenboğa International Airport, Sabiha Gökçen International Airport, and Adnan Menderes Airport. In 2006, 2007, 2008, 2009, 2010 and 2011 THY carried 17 million, 19.7 million, 22.5 million, 25.1 million, 29 million and 32.6 million passengers with total revenues of US$2.23, $3.0, $4.5, $4, $5.6 and $7.1 billion, respectively.[6][7] The airline has 18,188 employees (30 June 2011). THY has been a member of the Star Alliance network since 1 April 2008. Other airline companies that are/were owned or co-owned by Turkish Airlines include AnadoluJet, SunExpress, Cyprus Turkish Airlines, North Cyprus Airlines and B&H Airlines.