The IMPACT union has said that it is not in a position to call off Wednesday's planned strike action by Ryanair pilots until it meets with the company.
The airline said that it is now prepared to meet union representatives on Tuesday in a bid to avert industrial action, after initially saying it could only meet them on Wednesday.
However, IMPACT said it needs clarifications from Ryanair on how it will handle matters into the future.
Union spokesman Niall Shanahan has welcomed the progress, but said that they cannot call off the strike just yet.
"We're certainly happy to meet Ryanair on Tuesday," he said.
"Realistically, we would meet them today, we would meet them in the next hour or so, because ultimately [as regards] the scheduled industrial action that's due to take place on Wednesday - we're not in a position to make a determination about that action until we've met the company, until we've established the substance in their offer for pilot representation through a trade union."
He added: "All we have at the moment is the letter that came from Ryanair on Friday morning, indicating their willingness to recognise pilot unions.
"There is detail in that that needs to be explored. We need to establish the substance in that offer.
"The sooner we can meet them the sooner we can do that, the sooner we can make a determination about suspending the industrial action."