Not sure about customers, but I know that several people in the area described the event before the story surfaced.

http://www.nationalledger.com/artman...72610773.shtml
GotWake88 Reviewed by GotWake88 on . UFO Sighting There was a UFO sighting at Chicago O'Hare. Pilots and employees report seeing a metallic disk hover, then dart upwards, leavine a hole in the clouds. Before the story came out, residents called in, revealing exact descriptions. What does everyone here think about it and UFOs in general? I wonder what it would be like to smoke up with aliens. Kick ass. Rating: 5