Whenever you use AES and something wrong happens with the jetways, there's nothing we can do about it, because what AES is supposed to do, is to remove the jetways that comes with the scenery, and replace them with its own.
In your case, it seems that AES has successfully managed to remove the jetways that comes with the airport, but has failed to replace them with its own. So, it's something you should ask to Aerosoft support.
Note that, buying KDFW or any other FSDT airport, will give you the right to use GSX for free at such airports. In addition to that, if you don't install GSX, you'll lose all marshallers and all docking systems that comes with the airport so, you should consider GSX to be a mandatory (free) download if you have at least one FSDT scenery.
And, all our sceneries already come with animated jetways by default. And soon, we'll update all of them (KLAS, KMEM, KIAH and KCLT already use SODE jetways) to feature the more realistic SODE ones.