static jetways that are visible in P3D but GSX does not pick up that they are there and therefore cannot 'exclude' them. You can create new jetways but can't get rid of the original (visible) jetways.
Exactly. If a jetway is embedded in the terminal building, there's only one person that can exclude it, and it's the original scenery designer.
Well...technically, this is not *entirely* true. You might be able to fix such sceneries by opening their .BGLs with this tool:
https://www.scenerydesign.org/modelconverterx/- Find the .BGL that contains the terminal with the embedded jetways
- Open it in ModelConverterX
- Open the icon named "Object Hierarchy"
- The Hierarchy editor will open. Be sure "Highlight selected" is enabled.
- Scroll through the object Hierarchy, and see what's being highlighted in red. Eventually, you'll find the jetway.
- Click the "Remove" button. The jetway will disappear.
- Repeat this for all those static jetways.
- Save back the .BGL file.
This MIGHT work but, please, do not ask for further support: you are really on your own with this, and it would be much better if you pressed the scenery developer to model jetways as separate objects, which will make life easier for everybody.