I haven't said to uninstall GSX. I only said to reinstall it.
You said you uninstalled GSX so, most likely, you replied Yes to the question "do you want to remove the Addon Manager ?", which will remove the whole Addon Manager folder, which includes all the files required by the airports so, it's entirely normal this would happen, and the pause you described are caused by the sim not finding the objects required by the sceneries, which are no longer there, because you uninstalled GSX and asked to remove the Addon Manager.
Reinstalling the airports (using their current installers), will surely fix this.