Not sure what's going on tonight but now I see AC830 appears to be turning around heading. I wonder what's going on. Between the bomb scares at JFK and VS40 emergency landing at Gandar, is this the normal amount of flight interruptions in one night?
It could very well be mechanical problems not allowing them to continue into ETOPS airspace, therefore an air return. It may not necessarily be an emergency. While not normal, these things happen more often than people think.