The O'Hare Airport Sighting

On November 7, 2006, at least a dozen United Airlines employees, including ramp workers, pilots, and supervisors, reported a dark grey metallic disc hovering below the cloud deck over Gate C17 at Chicago O'Hare International Airport. Witnesses said it then accelerated straight up, punching a visible hole in the overcast. The FAA attributed the reports to a weather phenomenon and did not investigate. The Chicago Tribune's story on the case became one of the most read in the paper's website history.

Around 4:15 p.m., a ramp employee pushing back United Flight 446 noticed the object and alerted others. Witnesses across the terminal area described a disc, estimated between roughly 6 and 24 feet in diameter, holding position for several minutes below a 1,900-foot ceiling. Multiple witnesses independently described its departure as near-instantaneous vertical acceleration that left a crisp circular gap in the clouds, through which blue sky was briefly visible.

United initially denied any report existed. FAA tapes obtained under FOIA recorded a United supervisor calling the tower to ask about the object. The FAA subsequently said the sighting was likely "weather," suggesting hole-punch clouds, and declined to investigate since the object did not appear on radar.

The witnesses were airline professionals whose jobs involve constant observation of airport airspace, a point every account of the case stresses. Journalist Jon Hilkevitch broke the story in the Chicago Tribune on January 1, 2007. The Chicago-based NARCAP organization, which studies aviation safety aspects of unidentified phenomena, produced a long technical report.

Witness testimony and the FOIA tower recordings. No photographs or videos have ever surfaced, which is itself a much-discussed feature of a 2006 airport sighting. Nothing appeared on radar.

The FAA's position: no radar target, probably weather, no investigation warranted. United told employees not to discuss the matter, according to the Tribune's reporting.

Skeptics find the hole-punch cloud explanation apt: such formations occur when aircraft seed supercooled cloud layers, and a dark lenticular fragment or an optical effect below the deck could seed a disc perception. They stress the absence of any image from an era of camera phones (though 2006 phone cameras were poor) and the lack of radar data. Proponents respond that hole-punch clouds do not hover as a defined metallic disc for minutes in one spot before the hole forms, and that a dozen aviation professionals at close range described exactly that. NARCAP's report treated the object as unidentified and criticized the FAA for ignoring a potential safety issue. The case remains a one-afternoon mystery with unusually credible witnesses and unusually thin physical evidence.