A disc-shaped UFO appears during an air show in Kansas

On October 2013, during an air show in Kansas (Missouri), a flying saucer has been photographed inadvertently. Object, not visible at naked eyes, was circular, black and his size was huge!

Witness statement:

Noon October 13 2013. Guinness Book of World Records was at KC Chiefs for record breaking 50 plane fly over. I was photographing the event with my children along with several others. Using a Canon 400 with zoom at 3 FPS.

Never seen the object until I down loaded images onto my computer. Object did not appear in any other frame but the one. At first glance I dismissed it as a probable bird until I enhanced the photo and it showed no structure. It was there and in 1/3 of a second gone. None of us saw it but for the photo.