Although this item started up a long time ago I have a comment to add. In FSX PS2 often black (non-transparent)glass textures are caused by white alphalayers in the glass texture. Changing the colorvalue of the alphalayer to something like black (say RGB 0,0,0) or gray (say RGB 70,70,70 )gives you variants from totally transparent to smooky glass. So open up your glass texture p.e. with DXTBmp and rework the alphalayer with a suitable graphics program. Save it back to DXTBmp and save the results in DXTBmp to the original glass texture. Hope this helps a bit.