I have tried to make some very reflective skins, but none of the specular maps on airplanes are loading (images 1,2 and 3).
everything looks fine in model viewer (images 4,5 and 6)and reflections on buildings are working(image 7).
I have included both skins for reference.
https://drive.google.com/open?id=11SGTwcbtKbS_AaT1wsqQmpAJZNhR8O2M