Semi-spherical UFO sighted by pilot in North Carolina

Summary

A pilot and a passenger reported a semi-spherical object with a dark suspended body that suddenly accelerated and disappeared in 20 seconds. Initially thought to be a weather balloon, its unusual behavior left them puzzled. The investigation concluded it was likely a balloon, though its rapid movement and clear shape raised doubts. Weather data and the lack of other sightings supported the balloon theory, though other explanations weren't entirely ruled out.