A meeting between Minister for Transport Eamon Ryan and Ryanair CEO Michael O'Leary has failed to see agreement reached between both men on Dublin Airport's passenger cap.
Speaking after the meeting, Mr O'Leary said there was no meeting of minds.
He accused the minister of being "all talk, no action, no delivery".
However, Mr Ryan described the meeting as "good". He added, however, that there were areas of agreement and disagreement.
Fingal County Council is considering a planning application from Dublin Airport to exceed the passenger cap of 32 million passengers per annum.
Mr Ryan insisted that the planning process must be respected and that he would be breaking the law by intervening and removing the passenger cap.
Mr O'Leary warned that growth would instead be directed to other European countries.
He rejected suggestions that regional airports, such as Cork and Shannon, could be expanded instead, saying that people travelling to Ireland mostly want to go to Dublin.
Mr Ryan added that one area they agreed on was the need to reach net zero by 2050 and that Ryanair was making "good progress" in this regard.
Mr O'Leary also said he would not stop making personal jibes towards Mr Ryan.
"You see it in the Dáil every day. They're all shouting abuse at each other. I don't think I'm abusive. I mean, I don't think calling him a dunce for failing to deliver his own aviation policy is personally abusive. I think it's a statement of fact," he said.
Mr Ryan was asked if he raised the issue of personal attacks during the meeting. He said that he did not.
He told reporters that he was not overly concerned about personal insults but was instead more interested in hearing about Ryanair's sustainable growth plans.
Mr Ryan said the company had done better than most airlines in this regard, by investing in green research and technology.
