Highlands and Islands Airports Ltd said it had seen an increase across its regional network.

Loganair will suspend flights between Inverness and some islands due to industrial action at airports.

Hial's Dundee Airport is closed on Monday and six other sites are to be affected later this week.

Prospect members at Highlands and Islands Airports Ltd have escalated their dispute over pay.

Dundee, Sumburgh and Tiree are among the sites caught up in a staff pay dispute.

The action over pay follows strikes at Highlands and Islands Airports Ltd's sites in December.

Air travellers have been warned to expect disruption at regional airports on 19 and 22 December.

Eleven airports face disruption over the festive period after Unite members vote to take action.