The only thing holding me back from buying this and Zurich is this problem with airplane shadows and AI planes.
This is only relevant to Zurich. Geneva (and KORD and JFK) do not show this issue.
This problem has nothing to do with my WOAI planes not being FSX Native
It has everything to do with the fact you are using FS9 models COMBINED with custom runway lights, which were needed to create a custom runway texture at Zurich, which was a very distinctive feature of that airport. Default traffic (which of course is FSX native) works at Zurich.
It's not "just" the use of FS9 AI models, is the *combination* of using FS9 AI models with custom runway lights AND with airplane shadows on.
Also, if I disable the runway lights bgl in 3rd party airport sceneries, I can see all my AI planes with shadows.. but I need those lights...
Yes, but I think the best solution would be, instead of removing the runway lights, simply turn off airplane shadows in the affected airport. In our case, it's just Zurich.
Have you figured out a way to solve this problem yet?
Not without replacing the Zurich runway with a default one. That's why we always said it's the AI that should be upgraded. Airplanes (and AI modelers) DO have a solution, which is simply to recompile their existing models with the FSX SDK. Scenery designers don't have any solution, apart from lowering the scenery quality and getting rid of the custom runway textures.