Thai returning to Istanbul after 25 year hiatus
 

From December TG will resume service to IST, operating daily flights in a joint venture with Turkish Airlines, route was last served in 1998 before Asian financial crisis later that year A300 and DC10 were used with flight going onto Athens.
https://www.flightglobal.com/networks/turkish-airlines-and-thai-airways-eye-istanbul-joint-venture-operations/154452.article