Pilots' representatives are meeting to consider a deal designed to end the dispute which led Aer Lingus to ground its flights over the holiday weekend.
A majority of the airline's 530 pilots are meeting at the Aer Lingus staff club at Dublin airport tonight where the vote would be conducted.
An IMPACT spokesman said discussions and the voting procedure could last late into the night.
He added that there was a possibility of some flights resuming tomorrow if members voted to accept the proposals.
Management at the company last night accepted recommendations, drawn up by the Labour Relations Commission (LRC), to break the deadlock over controversial new working rosters for pilots.
In a significant breakthrough this afternoon, the committee of the Irish Airline Pilots Association, affiliated to the trade union IMPACT, confirmed it would recommend that pilots accept the proposals at tonight's vote.
Full details of the proposed settlement have not been made public but it is understood to limit the number of times the airline can order pilots to fly after rest periods of just 10 hours between shifts.
It also calls for pilots to commit to the implementation of a company survival plan under which the now-disputed roster arrangements were drawn up.
Following 11 hours of talks at the Labour Court on Saturday, LRC deputy chairman Mr Kevin Duffy passed his recommendations onto airline management and the pilots' union IMPACT last night.
Within hours the airline said in a statement: "Having considered the recommendation in full, Aer Lingus has indicated its acceptance to the court that implementation of this recommendation will meet in full the objectives of the survival plan."
Among the proposals are that the airline can only order pilots to take just 10 hours rest between shifts six times a year, and then only in exceptional circumstances.
There are further proposals on days off, early duty and rest periods on transatlantic flights. In the main, the minimum rest period should be 12 hours, or the equivalent of the previous duty plus two hours, the peace plan suggests.
Despite the apparent breakthroughs in the dispute, all services remain cancelled with no firm date for a resumption of normal operations.
It is understood that even if the pilots were to accept the deal, it may take several days for services to get back to normal.
More than 100,000 passengers have been inconvenienced by the airline's decision to ground its fleet after a one-day strike by pilots last Thursday.