A 48-hour strike over pay and conditions is planned from today by security staff at Scotland’s regional airports.
The walk-out, affecting 11 airports, is set to start at midday.
The Prospect union and Highlands and Islands Airports have been holding talks in the hope of resolving the dispute over pay.
The company said all of its airports would operate as normal, as would all scheduled services apart from a Dundee-Stansted service.
A spokesman said scheduled passengers intending to fly were advised to arrive 15-20 minutes earlier for their flight and limit the amount of hand or check-in luggage they take to the airport.
Passengers should confirm the status of their flight with their airline before leaving for the airport.
Hial managing director Inglis Lyon said: “Whilst we are disappointed that the industrial action is taking place, we have been working hard to develop contingencies to enable the airports to remain open and minimise the amount of disruption for our passengers.
“We would like to thank passengers, in advance, for their co-operation and understanding during this period, and we would also like to thank the local teams for their support and helping it be business as usual.”