O'Hare International Airport UFO sighting

The Chicago O'Hare UFO sighting occurred on November 7, 2006, around 4:15 p.m. when 12 United Airlines employees and Andres, a witness from Torreon outside the airport at Chicago O'Hare International Airport, reported a UFO sighting. The Federal Aviation Administration declined to investigate the incident because the UFO was not seen on radar and called it a "weather phenomenon".

https://en.wikipedia.org/wiki/2006_O%27Hare_International_Airport_UFO_sighting