AIG does not land any planes anymore, departures and gate spawning is working, but all planes in the sky are injected at very high altitudes (30k ft+) even on final and never land. They either circle around the airport or fly straight past it until they eventually despawn.
I'm not sure what causes this problem.
MSFS bug since SU11, we have a workaround implemented but it is not working at all locations. An improved workaround will come in one of the next updates