FILE PHOTO: Ryanair CEO Michael O'Leary holds a news conference in Machelen near Brussels, Belgium October 9, 2018. REUTERS/Francois Lenoir/File Photo

BERLIN (Reuters) - A hard Brexit could ground UK flights for up to three weeks but would be survivable for Ryanair RYA.I, the Irish budget airline's CEO Michael O'Leary said ahead of a meeting of European Union leaders in Brussels on Wednesday.

“You can ground aircraft for a week, two weeks, three weeks. It would be very painful,” O’Leary told Reuters in Berlin. “But we are a big company, we can survive.”

O’Leary had warned last month that there were no assurances that an agreement would be in place enabling flights to continue after Britain exits the European Union next March.

O’Leary said he did not expect Ryanair to grow in Germany next year, after closing its bases in the northern city of Bremen and at Weeze near Duesseldorf.

“Our traffic will be flat,” O’Leary said.

O’Leary reiterated that he was confident that Ryanair could resolve its dispute with German unions representing pilots and cabin crew. He said talks were making progress and that he did not expect further labor strikes in the coming weeks.

(This version of the story corrects to read UK flights in headline, paragraph one; corrects quote, paragraph two).