To say nothing, especially when speaking, is half the art of diplomacy.
Here are 3 web sites that have information regarding your question.
http://www.ataturkairport.com/eng/index.php
http://www.lonelyplanet.com/thorntree/message.jspa?messageID=14064854
http://www.worldtravelguide.net/airport/237/airport_guide/Europe/Istanbul-Atat%FCrk-International-Airport.html