Flight operations at India's busiest airport have been severely affected by fog, with sub-50m metre visibility causing some 140 flight diversions and delays. Passengers have had to endure waits of up to three hours while waiting for conditions at Delhi's Indira Gandhi International to improve.
Meanwhile, airports in other Indian cities have all been accepting diverted flights with the visibility at IGI airport just below the minimum required for ILS (instrument landing system) landings.
The Indira Gandhi airport fog has since lifted considerably but, still, delays are expected to continue for some time yet. It arrived on the scene at approximately 0000hrs but really started to take hold at around 0630hrs. Between 0700hrs and 0900hrs, nine scheduled inbound flights were rerouted and, during the same period, there were no takeoffs whatsoever.

Indian Airport Fog

"Six flights were diverted to Jaipur, two to Ahmadabad and one to Lucknow", IGI airport officials explained in an Indian airport fog statement. "Before being diverted the air traffic control asked them to hover over Delhi for a while but as the planes were running out of fuel, they were asked to divert to these airports."
Recently, DIAL (Delhi International Airport Private Limited) implemented a system called DA-CDM (Delhi Airport Collaborative Decision Making). This system helps airports maintain slick air traffic operations and manage passenger flow levels through keeping delays to a minimum and ensuring all available management resources are utilised. Data is shared between airlines, airport management, ATC (air traffic control) and handlers on the ground with a view to reducing congestion levels, boosting general airport efficiency and ensuring passengers are kept in the information loop.

Grounded IGI Flights

Despite the presence of the DA-CDM airport operation system, many IGI airport passengers affected by the grounded flights have been complaining about the lack of updates. According to NDTV's Delhi fog coverage, Indira Gandhi International's Terminal 3 has seen many such complaints be made.
Some complaints focused on Jet Airways Flight 821, which should have left for Chennai at 0650hrs. Instead, it moved out of its stand, taxied around part of the airport and then returned to its parking slot. Reportedly, its passengers were not kept updated as to its progress. 'Tussle between dense fog and our flight to Chennai; unfortunately the weather Gods win', one passenger Tweeted, while another added: 'Just read about flights at Delhi Airport being suspended due to fog. Brace yourselves for a harsh winter.'
Between 2012 and 2013, Indira Gandhi International Airport handled upwards of 34 million passengers. Through an expansion programme now in planning, it's expected that this figure will reach 100 million passengers by 2030.