A further strike is planned at Glasgow airport in an ongoing row over pay and pensions.
Members of the Unite union have warned they plan to walk out between 6am and 10am on June 24.
This is in addition to industrial action planned for Friday (June 14) between 4am and 8am and June 21 between 8.30am and 2.30pm.
The union staged 12-hour strikes last Friday and on Monday involving airport security officers, airport fire safety, airfield operations officers and engineering technicians.
Glasgow airport owner AGS Airports has previously pledged “robust contingency plans” to ensure full operations on strike days.
Unite regional industrial officer Pat McIlvogue said: “Unite has repeatedly offered to meet Glasgow Airport management at any time, at any place and under any auspices to find a resolution to this dispute.
“The workers are resolute and we will continue to add further days of action until Glasgow airport gets back round the negotiating table.”