I wonder what they did with AES to get it to work. On their jetways, the height can adjust up and down.
AES was made for FS9 when Flight sim didn't had any support for animated jetways, so it had to developed its own method, which is still in use in FSX. We also made animated jetways for FS9 using another system, but the FSX system is entirely different, and our FSX sceneries use that one, which is not very reliable, even default airplanes on default airports sometimes have trouble with jetways.
When comparing with AES, you shouldn't forget that you have to pay extra to have animated jetways, most developers simply don't have any animated jetways to begin with and some don't even give the option to buy AES.
We'll eventually have a look at the jetways too, eventually replacing the FSX system with our own, this is something we are surely planning to do.