Members staged 12 hours strike action on Friday (7 June) and Monday (10 June), prompting delays and disruption at security.

Now, Unite has pledged to stage further industrial action on top of its previously announced four-hour (4am to 8am) and six-hour (8.30am to 2.30pm) walkouts on 14 and 21 June.

The additional strike will take place on 24 June between 6am and 10am.

Airport security officers, airport fire safety, airfield operations officers and engineering technicians are among those represented by the union.

Unite says the airport has shown “no willingness” to enter further talks, despite its offers to meet – including via government conciliation service Acas.

The union is embroiled in negotiations over a pay claim and the airport’s pension scheme.

Pat McIlvogue, Unite regional industrial officer, said workers would continue to stage action “until Glasgow airport gets back round the negotiating table”.

The airport says it will enforce “robust contingency plans” to mitigate any strike action, and accused the union of failing to engage in “constructive dialogue” despite talks dating to January.

It adds the airport had increased its pay offer and tabled a “generous compensation package” in respect of its final salary pension scheme.