Turkish Airlines was founded on May 20, 1933. Officially called THY Turkish Airlines, the THY stands for Turk Hava Yollari. The airline is headquartered at Instanbul Ataturk Airport (IST) and has a fleet of nearly 340 aircraft flying to over 300 destinations in 120 countries. A member of the Star Alliance of airlines, Turkish Airlines joined on April 1, 2008. Their largest aircraft at this time is the Boeing 777-300ER, an aircraft they have 33 of.