Further attempts to avert next week's planned work stoppage at Aer Lingus are expected to be made today.
Workers are threatening to strike for two hours on Monday, in a move which would affect thousands of passengers.
SIPTU has rejected productivity demands put forward by the airline as part of a proposed resolution to a pensions dispute.
It is understood ICTU and IBEC will contact SIPTU officials today, in a bid to avoid the disruption.