However, I have just discovered a way around this.
You need the Airport Design Editor (which I believe you need the FSX SDK for).
Open up the airport in question, and then under 'Lists' in the top, choose 'Jetways'.
A list of the jetways in that airport will appear.
Double-click on one, and under 'Image Complexity' set a setting that is either lower than, or matches your autogen density setting.
Compile the airport, place it under Addon Scenery/Scenery, and you're good to go!

BTW, this may not belong here, but I figured it would be relevant to a lot of people, and may not have been noticed a lot, had I placed it in the scenery design forum.
