O'Hare's United concourse C, where employees at gate C17 reported the object Payton Chung from Chicago, CC BY 2.0, via Wikimedia Commons
United Airlines employees reported a dark, disc-shaped object hovering over gate C17 at O'Hare before shooting up through the clouds. The FAA said radar showed nothing unusual and suggested a weather phenomenon. The Chicago Tribune broke the story in January 2007.
