Woman and male friend witness very peculiar "very large, very slow" aircraft with strange disc mounted above it. Suddenly, the disc seemed to separate from the aircraft and move ahead of it, such that the crew in the cockpit could not have failed to see the object, the caller thought. The caller and her friend thought that the aircraft had no emblem or other markings on it, and they both emphasized how unusually slowly it appeared to fly. She and her friend both think that they have witnessed UFO's in the past.