Turkish Airlines is the national flag carrier airline of Turkey, headquartered in the Turkish Airlines General Management Building on the grounds of Atatürk Airport in Yeşilköy, Bakirköy district,Istanbul. It operates scheduled services to 146 international and 41 domestic cities (38 domestic airports), serving a total of 187 airports, in Europe, Asia, Africa, and the Americas. 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 and 2010 THY carried 17 million, 19.7 million, 22.5 million, 25.1 million and 29 million passengers with total revenues of US$2.23, $3.0, $4.5, $4 and $5.6 billion, respectively. During Skytrax's 2011 World Airline Awards ceremony, Turkish Airlines won Europe's Best Airline and Southern Europe's Best Airline awards, as well as the award for the world's Best Premium Economy Class Airline Seat. It is also 7th in the world's Best Airline ranking. The airline has 18,188 employees (30 June 2011). THY has been a member of the Star Alliance network since 1 April 2008. Turkish Airlines is currently an official sponsor of FC Barcelona, Manchester United F.C., Maroussi Basketball Club, Valencia Basket Club and the Turkish Airlines Euroleague Basketball. The airline also has Kobe Bryant as its brand promotion ambassador and Caroline Wozniacki, the No. 1 female player in the 2010 and 2011 tennis season, has become the new face promoting Turkish Airlines Business Class and Comfort Class through 2013. Other airline companies that are owned or co-owned by Turkish Airlines include AnadoluJet, North Cyprus Airlines, SunExpressand B&H Airlines. Turkish Airlines is in talks with JAT of Serbia to establish a new company to replace JAT Airways, which is in debt.