The Unite union has confirmed around 370 workers employed by Edinburgh airport have backed industrial action in a dispute over pay, while a further 320 workers employed by ICTS and Menzies Aviation at Glasgow airport have also voted in favour of striking after rejecting pay offers.
The union said strike dates would be announced "in the coming days", with action expected to coincide with the World Cup and Commonwealth Games events taking place in Glasgow.
Sharon Graham, general secretary of Unite the Union, said the disputes were the result of employers failing to offer fair pay deals despite strong profits.
"Workers across Scotland's largest airports have overwhelmingly backed summer strike," Graham said. "This is a direct result of their very profitable employers' refusal to make a fair pay offer.
"The workers have no other option and the blame for this situation lies entirely with wealthy companies choosing to boost profits before people."
A separate ballot involving around 70 ICTS workers at Aberdeen airport, who are also in dispute over pay, is due to conclude on Thursday (28 May).
An Edinburgh airport spokesperson told TTG: "Constructive talks on pay were held today with ACAS between Edinburgh Airport and its unions, including Unite. Further talks are planned for early next week."
Menzies Aviation, meanwhile, said it was "disappointed" by the decision to move towards industrial action, but insisted contingency plans were in place to minimise disruption.
A spokesperson said: "We have engaged constructively throughout and put forward a fair and workable offer for all parties that recognises the challenging operating environment caused by the Middle East conflict.
"Should industrial action take place, we have robust and proven contingency plans to minimise any potential disruption to our airline customers and their passengers, ensuring flights can operate as scheduled."
Meanwhile, an ICTS spokesperson said they had provided a pay offer "significantly above inflation", with further meetings scheduled.
It added: "Robust contingency plans are in place to ensure passenger safety and service continuity, and we are confident in our ability to maintain full operations."
