AER Lingus made a fresh promise to passengers that there will be no disruption to flights ahead of the results of a cabin crew ballot.
The company was waiting to find out the result of a ballot on industrial action today.
The row centres on the implementation of a €97m cost-saving plan at the airline.
Despite fears of chaos, Aer Lingus has insisted there will be no disruption to flights, no matter what the outcome of the vote.
While the cost-cutting plan was approved by cabin crew a number of months ago following an initial rejection, they are unhappy with the way the measures are to operate.
As part of the push to save money by Aer Lingus management, 'flight time' was to be increased to 850 hours per year.
Flight time begins when an aircraft starts to move from the terminal and ends when it comes to a stop after landing.
However, cabin crew also spend time performing other duties such as checking in.
Aer Lingus management described the decision to hold a ballot as "deeply regrettable".
The company said, after 10 months of talks and two separate ballots, it was at a loss to understand why another vote was necessary.
It added that cabin crew had already voted by 93pc to accept the Greenfield cost-cutting proposals, which Aer Lingus is now seeking to implement.
Impact has accused the company of breaching agreements, acting unilaterally, and of seeking excessive changes for staff.
Impact said, if the ballot was carried, cabin crew would work to the terms of their contract but there would not be an all-out strike.
Nevertheless, thousands of passengers could face disruption to their travel plans if the vote goes in the union's favour.
Aer Lingus said it "has the means to deal with every outcome".