You have to make sure that all of the nodes connect to each other. As for AI using the new taxi ways I doubt if they will. But I am not sure on that just make sure you save the changed airport. I put all of my AFCAD files in the addon scenery in a folder named AFCAD and a subfolder named Scenery. By doing it this way any time I add a file fs will rebuild the scenry indexes without me having to addit manually. 8)