Security staff at Dublin Airport have spoken of the "significant amount" of abuse they faced from members of the public on Sunday due to long queues.
Over 1,000 passengers to miss their flights out of the capital after being stuck in long queues for hours.
The Dublin Airport Authority has apologised for the disruption and offered to compensate those affected by the delays at the weekend.
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Speaking to RTE's Morning Ireland, an Airport Security Unit (ASU) officer who is also a member of SIPTU said that while he and his colleagues felt very sorry for passengers affected, security staff had also experienced a high level of abuse from passengers in the course of their duties.
In response, the daa said it was "committed to safeguarding all those who travel through and work at Dublin Airport".
Industrial Organiser with the Aviation Sector of SIPTU Jerry Brennan said the union has "constantly engaged" with the airport operator specifically in relation to staff being treated aggressively while carrying out their security duties.
He said that additional airport police and Garda presence have previously been applied to address this.
Mr Brennan added that while Sunday was a dreadful day for the travelling public, staff in the ASU have been operating under similar huge pressure since passengers started returning in great volumes six months ago.
The SIPTU representative said the union has also raised concerns with Dublin Airport over staff not receiving overtime payments in their pay slips.
The daa said its provider, Kronos, was impacted by a cyber-attack in December 2021 and that as a result the daa's payroll system was unavailable for 14 weeks between December 2021 and March 2022.
The daa said it "acknowledges the concerns with payroll that SIPTU has raised on behalf of its members, and this matter is a top priority for both the daa Board of Directors and Executive Team".
The daa added that it is "fully committed to ensuring that all of our people are paid correctly - first-time, and every time".
It also revealed it has made changes to the training process for new security recruits, which will see the training course into two tranches to "assist the security operation".
The first takes place over a two-week period and covers five competencies.
The airport operator is due to report back today to Government with a plan on how it will tackle long delays for passengers this summer, with its Chief Executive Dalton Philips set to appear before the Oireachtas Committee on Transport tomorrow to discuss the delays.
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