I wanted to know what is process for international transfer at Dubrovnik DBV airport.

I'm looking to book award tickets for my wife, one of the options has us arriving on Croatia Airlines from FRA and then departing to IST on Turkish Airlines.

If we get a multiple entry Schengen visa then we might be able to enter Croatia based on that. But if get only a single entry visa then we'll have to stay at the airport.

Does DBV airport have a secure international to international transit zone? Do we need to go through passport control?

Are there any lounges we can access for Star Alliance Gold in the international transit area?