Ryanair has written to IMPACT, setting out its plans to recognise the pilots’union.
IMPACT had given the airline a midday deadline to provide formal recognition, saying that strike action could be renewed if an agreement wasn’t delivered.
Last week, Ryanair broke from its long-standing policy of refusing to recognise unions.
The decision came as it worked to avert a pilots' strike that had been planned for yesterday.
The strike was suspended, and management met unions for the first time in the company's history earlier this week.
Unions, however, were disappointed that Ryanair did not provide assurance at talks on Tuesday.
In a statement after the meeting, IMPACT - which includes the Irish Air Line Pilots' Association - said: "The union reiterated its position that its mandate for strike action can be implemented, after the required notice is given, in the absence of a timely agreement."
Union leaders have now received a letter from the company.
IMPACT's Bernard Harbor explained: "We've very recently received correspondence from Ryanair in response to the meeting that we held on Tuesday evening.
"My colleagues are considering that correspondence, and we'll also obviously be talking to representatives of Ryanair pilots who were also involved in Tuesday evening's meeting. We hope to be able to say something with more substance before too long."
Joe Gill from Goodbody Stockbrokers says even with formal recognition unions still won't find negotiations easy:
Ashley Connolly from IMPACT says this "rescinds" the threat of industrial action.
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Ryanair boss Michael O'Leary has said the decision to recognise unions was his idea.
In an interview with Reuters earlier this week, he warned unions that if they put forward unreasonable demands he would simply shift planes and jobs to other jurisdictions.
Reporting by Juliette Gash & Stephen McNeice