With SU10 beta (or potentially before this, it’s been a little while), I’ve noticed that my airport is showing as a seaport!
It was released before seaports were a thing, but surely normal airports can’t change to a seaport. It’s no where near water…
All this seems to be embedded into the .bgl so I guess there’s no other way of fixing this? I guess I’ll need to dig up my old dev files and recompile it.
Have a read of this post. Had the same issue but Manwlo’s post outlines the possible fixe. In my case, it was lack of material on a transparent runway
Yup that’s probably what it was, it uses the base dirt runway texture (transparent). I’ll test again now that SU10 is out.
Thanks for the link! 
Hello guys,
Today I realised that on LDZA is the same story, it’s marked as seaport. Links from previous answers are not working for me, so if somebody knows little bit more about that problem it’s perfect. Thank you for your answers.
Had this myself and someone else. posted it on the other website.
Was given some instructions by devs for users to try. But those people who said it was an issue haven’t got back to me, so no idea if they worked.