There is a definatley a British Airways Terraces Lounge at Ataturk Airport which I used last September before a flight from Istanbul back to London Heathrow. From recollection the lounge was a distance from check-in and on the lower ground floor of the airport. The lounge was very busy when I visited and it was difficult to obtain a seat for passengers that arrived shortly before boarding (however, this was before an early evening 767 departure and an Iberia flight). Decent selection of newspapers, magazines, food and drink. Turkish beers available which was a fun way to have my last Efes! I hope that helps.