New Delhi, Dec. 17 -- Despite the national capital recording only shallow fog in the early hours of Tuesday, operations at Delhi's Indira Gandhi International Airport (IGIA) were impacted for a second consecutive day, with over 500 flights delayed and at least 131 cancelled, officials said. The disruptions on Tuesday were largely a spillover effect of the severe fog that engulfed the region on Monday, which disrupted flight schedules across northern India and between metro cities. Officials said several cancellations on Tuesday were carried out in advance to mitigate passenger inconvenience. Till Tuesday evening, over 500 flights stood delayed, according to data from flight tracking website FlightRadar24. A total of 131 flights were cancelled, including 52 departures and 79 arrivals, officials aware of the matter said. On Monday, visibility had plunged to as low as 50 metres due to dense fog.HTC...