International media reports suggest that the airport was shut down for over an hour after air traffic controllers at the Hohhot Air Traffic Management Bureau spotted what they believed was a UFO.
In the latest episode, several passenger jets were diverted from the airport at Baotou in Inner Mongolia for about an hour around 8 pm on Sep 11, reported ABC News.
Bright lights that moved erratically was reportedly spotted in the sky while air traffic controllers claimed that they detected the UFO on the radar.
After an hour, the object disappeared and the airport functions were restored.
While the previously reported UFO sightings were rubbished by the Chinese government as military exercises, the communist nation now maintains that there was no UFO sighting on Sep 11.