Shortly before 9:00 p.m. on July 7, 2010, air traffic controllers at Hangzhou Xiaoshan International Airport received reports of an unidentified object in airspace near the airport. Authorities responded by halting departures and diverting arriving aircraft to alternate airports, including Ningbo and Wuxi. Airport operations remained restricted for roughly an hour before normal procedures resumed. Contemporary reporting indicates that at least a dozen arriving flights were diverted and several departures delayed, affecting more than 2,000 passengers.

The incident quickly became international news because it involved a major commercial airport rather than an isolated witness report. Unlike many UFO cases that begin with a private sighting, the Xiaoshan event produced an observable operational consequence: a temporary disruption of civilian air traffic. That fact is not disputed. What remains unclear is the identity of the object that triggered the response.

As news spread, numerous photographs began circulating online showing luminous objects and streaks above Hangzhou. These images were widely presented as evidence of the event. Subsequent reviews, however, found that many of the most famous photographs did not originate from airport personnel and could not be securely tied to the actual object involved in the disruption. Several were later assessed as ordinary aircraft, long-exposure effects, or unrelated imagery. No authenticated public photograph of the initiating target has been conclusively identified.

Public explanations varied in the months following the event. Some reports suggested an unauthorized aircraft operating without permission. Others pointed toward military activity or testing. Additional commentators proposed conventional aviation or atmospheric explanations. No publicly released final government report has been located that conclusively identifies the object or fully reconstructs the event. Because of this, the operational disruption itself is well documented, while the nature of the triggering object remains uncertain.

The case remains one of the most cited modern Chinese UFO incidents because it combines official acknowledgment of air-traffic disruption with a lack of publicly available resolution. The central historical fact is not that an extraterrestrial craft was observed. The central fact is that airport authorities considered the unidentified target significant enough to alter flight operations at a major international airport.