This was already explained in the GSX thread:
GSX will not handle jetways in any way.
FSX is capable of handling jetways on its own so, it doesn't make any sense for an FSX native product like GSX to handle jetways, since every FSX default airports support jetways, and every proper FSX airport (like all our own) should support FSX jetways too.
AES has animated jetways in FSX as a consequence of having to add them in FS9 which didn't had any, and it uses an FS9-styled method in FSX as well, which doesn't work with AI, even with those having proper exits.
If you use your AI collection with proper exits in a *proper* FSX scenery that supports native jetways, like all our airports, they'll work irregardless of GSX being present or not. If you have an airport that doesn't support FSX jetways, GSX will not do anything to fix this.