The DAA and Ryanair will take their legal bid to the High Court today to stop planned strike action at the country's main airports.
SIPTU members are planning to down tools in a four-hour work stoppage at Shannon, Cork and Dublin Airports this Friday.
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Strike action is due to take place between 5am and 9am on one of the busiest days before St Patrick's Day.
It is part of a long running dispute about cuts to pension benefits at Aer Lingus and the Dublin Airport Authority.
The DAA and Ryanair claim the strike is unlawful.
