There are no plans to call off threatened industrial action at Aer Lingus and the Dublin Airport Authority on March 14, according to Irish trade union Siptu.
Staff at the airline are opposed to changes being made to their pensions without their consent.
Airport authority employees also face reform of their pension arrangements.
A four-hour strike, from 5am to 9am, is due to go ahead at Dublin, Cork and Shannon airports.
An expert panel has been appointed to investigate the long-running dispute over threatened benefit cuts in the joint aviation pension scheme.
It is due to issue a preliminary report at the end of the month, the BBC reported.
The dispute centres on a €750 million deficit in the pension scheme that covers staff at the airline and the DAA.