Turkish Airlines is the national flag carrier airline of Turkey. It operates scheduled services to 315 destinations in Europe, Asia, Africa, and the Americas, making it the largest mainline carrier in the world by number of passenger destinations. The airline serves more destinations non-stop from a single airport than any other airline in the world, and flies to 126 countries, more than any other airline. The airline's cargo division serves 82 destinations. The airline's corporate headquarters are at the Turkish Airlines General Management Building on the grounds of Istanbul Atatürk Airport in Yeşilköy, Bakırköy, Istanbul. Istanbul Airport in Arnavutköy is the airline's main base, and there are secondary hubs at Ankara Esenboğa Airport and İzmir Adnan Menderes Airport. Turkish Airlines has been a member of the Star Alliance network since 1 April 2008.