New Delhi: A dense layer of fog has shrouded the national capital hindering flight services badly with over 400 planes delayed amid poor visibility conditions for the second day in a row. Delhi and parts of north India have been witnessing a continuous drop in temperature and a thick layer of fog covering the sky. On Saturday, Delhi airport witnessed a diversion of 19 flights and many cancellations, while more than 400 flights were reportedly delayed. According to a report in PTI, an official said that 19 flights were diverted at the airport between 12.15 am and 1.30 am due to reduced visibility. Thirteen of these were domestic, four international and two non-scheduled flights.The official said over 45 flights were cancelled due to bad weather conditions at Delhi airport as well as at the destination airports, the report added. Information on flight tracking website Flightradar24.com, stated that more than 400 flights were delayed at the Delhi airport, news agency PTI added.A 10:02 pm, the Delhi airport missed a statement and said that low visibility procedures were underway at the airport and flight operations were normal. Earlier in the day, Indigo had earlier put arrivals and departures on hold temporarily. "While landing and takeoffs continue at Delhi Airport, flights that are not CAT III compliant may get affected. Passengers are requested to contact the airline concerned for updated flight information. Any inconvenience caused is deeply regretted," the Delhi International Airport Ltd (DIAL) said in a post on X at 6.56 am. According to the weather department, a yellow alert has been issued for dense fog in most of the areas in the city on Sunday. The minimum temperature is predicted to touch 10 degrees Celsius mark while the maximum is expected to be 18 degrees Celsius.