Aer Lingus management are working on contingency plans to help passengers continue with their travel plans in the event of a walkout by its staff next week.
The company has advised customers that disruption to travel on Wednesday, Thursday or Friday of next week is a possibility.
Siptu yesterday considered a letter from Aer Lingus that warns of staff suspensions unless there is co-operation with new working structures.
The airline is demanding that staff assist in training new employees recruited on lower terms and conditions.
Aer Lingus is seeking to reduce annual leave, change shift allowance payments, reduce overtime, and introduce more flexible working hours and practices. It also wants to cut time off in lieu for working bank holidays.
Siptu's 1,800 members at Aer Lingus are preparing to withdraw their labour from March 1st if the airline does not back down on plans to introduce new contracts for existing staff.