Turkish Airlines is the national flag carrier airline of Turkey. It was founded in 1933 and is headquartered in Istanbul. It operates flights to more than 300 destinations in over 120 countries around the world.
Turkish Airlines' logo most likely uses Mark Simonson's Proxima Nova ExtraBold font, which was created in 2005. He updated his 1994 Proxima Sans typeface to create Proxima Nova, which combines geometric design with current proportions. You can view the full font family of 42 fonts here.
UPDATE: Turkish Airlines updated their logo and the new font looks like a modified version of Statement Sans which is available to download here.