ROUTE UPDATE: Turkish has switched from the 777-200 to A330 to 777-300ER on the Buenos Aires Ezeiza (EZE) to Istanbul (IST) route

During the last few months, Turkish Airlines changed the equipment it operates on the Buenos Aires Ezeiza (EZE) - Istanbul (IST) route from the 777-200 to the A330, which features Comfort Class, to the 777-300ER with the airline's new Premium Class offering.   
Source:

http://www.siscoma.com.ar/online/aviacion/2014/avn140501/avn-140501.html