November 7, 2006 · Chicago, Illinois, United States
United Airlines personnel and airport workers reported a dark, disc-like object hovering above gate C17 at O'Hare before it shot upward and allegedly punched a circular opening in the cloud layer.
Because witnesses included trained aviation staff at a major airport, the case received wide media attention despite lack of radar confirmation.
No formal NTSB-style deep investigation was publicly released for the event.
Journalistic investigations and witness interviews remain the primary documentation sources.
Skeptical readings include hole-punch clouds plus misperception under uncertain visibility.
Anomalous interpretations emphasize multi-witness airport-professional consistency and structured-object description.
O'Hare became a modern civilian-airport benchmark case.
It is often cited in calls for standardized FAA/UAP reporting pathways.
This page presents documented research and reported phenomena. No claims about validity or mechanism are made by this archive.