The planned strikes will follow similar actions on Friday and Monday when airport security and fire employees, as well as engineering technicians, stopped performing their duties for 12 hours, thereby causing long delays at the airport.
"It has now been announced that a further four hour stoppage will take place on Monday 24 June 2019 between 06:00 to 10:00 to add to the forthcoming days of action: 14 June between 04:00-08:00 [and] 21 June between 08.30 and 14.30," the trade union said in a statement.
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Pat McIlvogue, Unite regional industrial officer, said that "the workers are resolute and we will continue to add further days of action until Glasgow Airport gets back round the negotiating table," noting that the trade union was ready to engage in talks.