Aer Lingus management has said it was disappointed with the result of today's ballot by SIPTU members and said it was again urging all staff groups to enter into discussion on its Programme for Continuous Improvement.
A spokesperson for Aer Lingus said staff costs were completely out of line with the market and its competitors.
The company said it was already in discussions with the airline's other major union, IMPACT, and was prepared to do the same with SIPTU.
However a spokesperson said those talks would have to take place without preconditions.
Earlier, workers at Aer Lingus voted in favour of industrial action in a row over cost-cutting measures at the airline.
A 96% majority of SIPTU members voted in favour of the action, which could begin by the end of the month if the row is unresolved.
The union's National Industrial Secretary Michael Halpenny said: 'This shows a very clear determination on the part of union members to defend their agreements and to defend themselves against unilateral attacks by the Aer Lingus management on agreed pay and conditions.'
The union has said it will not enter talks at the Labour Relations Commission until the company suspends its cost-cutting measures, which have already been introduced for new staff.
The union says the company is in breach of existing agreements to negotiate for change and that the matter should be referred straight to the Labour Court.
The company says its staff costs must be reduced it the airline is to stay competitive.
Mr Halpenny said: 'Our members are left with no option but to take the course that they have. This is a totally avoidable dispute.'
The IMPACT trade union is also expected to ballot for industrial action.
