Staff at Dublin Airport have confirmed they'll walk off the job three days before St. Patrick's Day.
SIPTU members at the company will stop working for four hours on Friday the 14th of March.
Workers at Shannon and Cork airports, as well as Aer Lingus, are also taking part, in a row over pensions.
A four hour work stoppage will take place at all of the airports from 5.00 a.m. to 9.00 a.m. on Friday the 14th March, ahead of the St Patrick's bank holiday weekend.
The move follows what the union describes as the refusal of the companies to engage in meaningful talks - or to present reasonable proposals during discussions aimed at resolving the pensions dispute.