How do aircraft land under zero visibility conditions during dense fog

As many as 19 flights were diverted, and over 200 flights to and from Delhi's Indira Gandhi International Airport (IGI) were delayed on Saturday as low visibility due to dense fog impacted operations for the second straight day in the city. On Friday, over 400 flights were delayed.

Delhi and its adjoining areas of Noida, Gurugram and Ghaziabad have been witnessing dense fog for the past two days, resulting in an impact on road and train movement also apart from flight operations.