Air traffic controllers, employed by Highlands and Islands Airports Limited (Hial), are in dispute with the airport operator over pay.
The BBC reports as many as 5,000 passengers are likely to have been affected by three 24-hour strikes this week (21-23 July).
Hial managing director Inglis Lyon has apologised for the disruption. “We deeply regret the inconvenience to passengers affected by this strike action,” he said in a statement.
