It isn't in Slovenia.
Reminders:
- The buildings you can see in the last image are still present.
- South is approx. at the top of the image.
- When searching for "town name" and "airport" in GE, the current/modern airport is shown.
- Even when searching for the full name of the airfield, this current airport is shown
If you zoom out from the modern airport, the one in the image will appear.
ADDED:
My reply crossed with Davidsoffice.
Bingo,
Mostar Jasenica it is. Well done, you have control.