Disruption of Aer Lingus flights is expected next week after ground staff said they intend to go on strike next Tuesday and Friday.
Aer Lingus faces another strike
The Trade union SIPTU said new employment contracts for temporary staff will force them to work more hours for less money.
The airline said it has to cut costs to remain competitive.
Aer Lingus recently narrowly averted a strike by pilots over conditions at the airline's new Belfast hub.