Security screeners at Perth Airport's Qantas terminal are poised to strike again after their employer locked staff out of the job for wearing "Paid Less in the West" T-shirts.
United Voice assistant secretary Pat O'Donnell says 11 screeners who were rostered on from 9.30pm (WST) on Sunday were frogmarched from the terminal within 30 minutes for donning the T-shirts and handing out stickers to travellers.
He says the move reduced the number of screening points from two to one, and brought the total number of screeners indefinitely locked out of the job to 25.
The screeners are protesting against their employer MSS Security for offering them lower wages than many of their interstate counterparts.
Rolling strikes were held from Tuesday to Saturday last week, and union members will meet later on Monday to decide whether to take further industrial action.
"If they think locking people out is deterring people, it's just making them more determined," Mr O'Donnell told AAP.
He said 40 screeners protested outside the terminal on Sunday night as part of the campaign.
"If Qantas wants to not have lots of angry people outside their doorstep, they should be making sure there's fairness in their workplaces.
"We'll keep on campaigning until we get some sort of movement."
The action coincided with heavy fog on Sunday night and Monday morning that delayed flights at the airport, leaving long queues of frustrated travellers waiting for their flights to be rescheduled.
"Certainly, a bit of of chaos out there at the moment in all different ways," Mr O'Donnell said.
But a Qantas spokeswoman said the fog - not the screeners' crisis - had caused delays to six flights, including one that was diverted and one that was cancelled.
