All landings are taking place under CAT-III B landing system, the sources said, adding arrivals resumed about an hour ago.
    
CAT-III B allows the aircraft to land in visibility as low as 50 meters.
     
Minimum visibility required for CAT III landing at Delhi Airport is 50 meters and for low visibility take-off operations (LVTO) it is 125 meters.
    
GMR-run IGIA is the only airport in the country equipped with CAT IIIB.

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