Flights operated between Calcutta and Guwahati after two days on Tuesday but the dust storm that had cut off air link on the sector continued to cause cancellations.

Three flights from Calcutta landed in the Assam capital city after the instrument landing system (ILS) at Guwahati airport was pressed into service on an emergency basis around 5pm on Tuesday, said an official of Airports Authority of India. The ILS at the airport was not in use since March 5 because of extension of the runway.

Morning flights to Guwahati were affected as the visibility at the Assam airport dropped to 1,200 metres, below the required 2,800 metres when ILS is not in operation, said airport sources. Seven flights from the city to Guwahati were cancelled. Flights also did not operate from Guwahati to Calcutta.

Airport officials said services would be normal on Wednesday.

Hundreds of passengers were stranded at the city airport because of the delays and cancellations and some staged a demonstration.