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Passengers flying out of Glasgow Airport are experiencing security delays due to a strike by staff.
Members of the Unite union at Glasgow and Aberdeen Airports walked out at 04.00 - the first of two 12-hour strikes by security staff, fire and operations teams.
It follows a breakdown in talks about pensions and pay with owner AGS Airports.
Glasgow Airport said queues at security were "longer than normal".
It tweeted: "We apologise to our customers for the delay at security this morning.
"Following the commencement of industrial action and transition to our contingency in security, we have experienced longer than normal queues."
Aberdeen Airport said there would be no disruption to passengers.
The strike does not involve check-in staff and baggage handlers.
AGS had earlier said "robust contingency plans" would be put in place to ensure "business as usual" at both airports.
About 400 people are likely to strike in Glasgow alone, but airport bosses have brought in the same number of staff to cover.
About 300 people are expected to be on strike at Aberdeen.
AGS Airports Limited owns Glasgow, Aberdeen and Southampton airports.
The union claims the company closed the consultation process on pensions on 24 May, as it attempted to close a defined benefit pension scheme.
This, they say, broke an Acas agreement made in 2016 to keep the scheme open to existing members.
Regional industrial officer Pat McIlvogue said: "Unless the company get back round the negotiating table, we cannot rule out further dates being added to those already announced in a dispute solely manufactured by AGS management."
'No willingness'
An AGS spokesman said: "We have been in talks since January and, despite attending Acas, there continues to be no willingness whatsoever on the part of Unite to engage in any constructive dialogue.
"We made a significant improvement on our initial pay offer, which was increased from 1.8% to 3% in line with demands.
"This was rejected by Unite without any further consultation with members, and the union continues to deny them the right to make a decision on the offer of 3%."
He added: "In regards to our final salary pension scheme, it is simply unaffordable with the cost to the company due to rise to 24.7% per employee.
"We tabled a generous compensation package for the remaining members, which again was rejected by Unite without first consulting its members.
"As always, we remain open to continuing dialogue with Unite to resolve this dispute."
The strike will end at 16:00.
A further 12-hour strike is planned at both airports on June 10 and a four-hour walkout at Glasgow on 14 June.