How to add the Black-yellow Star symbol on freeware addon Airports?

I’m pretty sure this is the wrong section, so feel free to move this post.

I’m not a scenery creator, only a user with too much freeware addon airports, and I 've lost the overwiew on the ingame world map over the time.

It is possible to use the SDK to add this black-yellow star symbol to those airports? (like those from

Topic moved into SDK General.