Dublin Airport staff have been left feeling 'frustrated and demoralised' over six-month-long pay issues that meant employees were missing hundreds of euros, unions have said.

The DAA has been grappling to resolve issues with its time-keeping system since it was the subject of a cyber attack six months ago.

The issue has also impacted on workers' annual leave requests.

Jerry Brennan, of Siptu's aviation sector, said that the problems are causing "huge amounts" of stress to staff.

Mr Brennan said: "It's caused great difficulty around time-keeping. If time-keeping is not being recorded correctly, then pay is wrong.

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"You have people coming in to do overtime to try and alleviate the pressure in the airport, going over and above their contracted hours, and then they find in their pay packet two weeks later that their pay isn't there for it.

"People are also having great difficulty in securing annual leave. They're not receiving the proper pay and reward for the hours they're working, so this has really caused a lot of frustration.'

The DAA were contacted for comment.