Unit was not visible to the necked eye. I try to take around 500 digital photos around the Hickory Airport each week. This week I had taken photos of what I call Eye-Oval droans or UFO’s. This photo was a total surprise, and appears to be operated by someone inside the unit.These objects travel between 2,000 and 4,000 miles per hour. The human eye and brain is not capable of detecting the same. I experience no change while photographing the subjects.