The operations at the airport had to be shut down for close to two and half hours, sources at Air Traffic Control (ATC) at the airport said, adding that the magnitude of the disruptions in traffic was more than what was anticipated.
"The situation is slightly unique, the disruptions are mostly on account of wind shear... the number of diversions are now touching 70," the sources said.
The air traffic operations began to normalise by 9 pm and the backlogs were clearing fast, they said.
Wind shear refer to a rapid change in winds over a short horizontal distance experienced by aircraft, conditions that can cause a rapid change in lift, and thus the altitude, of the aircraft.
According to an airport official, the wide-spread disruptions can also be attributed to the time of the storm which hit the airport during the rush hours and continued for over two hours.
As the disruptions worsened, various airlines took to the Twitter announcing the delays, with Vistara saying that operations of its airline would normalise by 2 am. It announced the cancellations of one its flight from Bhubaneswar which was diverted to Jaipur.
International flights from Kathmandu, Riyadh, Colombo, Jeddah, Kabul were delayed even as flights from Tokyo, Newark and Colombo were diverted to other places, the sources said. Reports said some 10 international flights were diverted to Lucknow after the ATC at the IGI airport refused permission to land.
An official of an airline said that given the magnitude of the diversion, it would take close to 24 hours for them to normalise operations while sources at the airport said the exact number of diversions and cancellations would become clear by tomorrow morning.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)