UAL990 from IAD to ACC diverted back to IAD after only an hour of flying. I live in the path that this flight took back to IAD and it flew directly over my house. But, it was very strange. I heard the very loud noise of the plane overhead (a quick check shows that it was flying at only 6,000 ft) and once I heard it move off into the distance, about 15-20 seconds later, I heard an even louder noise from a plane engine. My immediate thought was that maybe this flight was being escorted back by fighter jets, but I can find nothing about this diversion.
Anybody have any ideas?