Please uncheck any airports you do not want in your selection, and then press the 'Show me how to get from SKG to IST' button at the bottom of the screen.

Matches for SKG as three letter airport code or city name

Include	Airport name	Airport code	City	Country
	Thessaloniki	SKG	Thessaloniki	Greece

Matches for IST as three letter airport code or city name

Include	Airport name	Airport code	City	Country
	Ataturk	IST	Istanbul	Turkey