Almost all flights were operating as per their schedule, despite a drop in runway visibility due to the shallow fog which enveloped over the airport early this morning, sources at the airport said.

The runway visibility range was above 2,000 metres throughout last night but it decreased to 700 metres at about 7.30 am this morning, forcing airport authorities to implement low visibility procedures.

Earlier, flights were operating under CAT-I and CAT-II conditions as the fog was not so dense, an airport official said.

The IGI airport has been witnessing disturbance in the flight schedules for the past two days. Yesterday, over 75 flights were affected due to inclement weather conditions.