Over 27 flights cancelled, many more delayed at Delhi Airport due to fog

As many as 27 flights of various airlines were cancelled and many more delayed at Delhi Airport on Thursday due to dense fog and subsequent drop in visibility, a DIAL official said.

"As of now, 27 flights are cancelled -- 16 departures and 11 arrivals -- at Delhi Airport due to dense fog and low visibility," the Delhi International Airport Ltd (DIAL) official said.

In a passenger advisory Thursday morning, DIAL said due to dense fog, "flight operations are currently under CAT-III conditions, which may lead to delays or disruptions."  For this type of operation, not only should the pilots be trained, but the aircraft must also be compliant.

CAT-III refers to a type of instrument landing system (ILS) approach that allows aircraft to land in conditions of very low visibility, such as fog, rain or snow, with a runway visual range (RVR) of 50-200 meters.