Qantas CEO Alan Joyce has said that the aviation industry is worried about the consequences Brexit will have on global travel.
Speaking on RTE's Sean O'Rourke show, the Irish-born chief said that he hoped that there is a "good compromise" and that exit negotiations are "managed carefully".
"We all know it could be a shock for the Irish and the UK economies but [also] for the world economy," he said.
Mr Joyce (51) said that Qantas , who have been flying for over 70 years, has historical rights that go back before the European Union.
However, he said the difficulty for the airline will be changes to travel arrangements for people from the UK going back into Europe.
"We have a big base in London and a lot of our employees are in Continental Europe who fly to the UK.
"So will their work permits and work ability still apply? There's huge implications for businesses like ours that are on the other side of the world."
The Dubliner also said that he is heartened that Ireland's economy seems to be on an upward trajectory.
"Having come back to Ireland occasionally every year for the last 20 years that I've been away, what's great is that the country is back on a high a bit, the economy seems to be doing fairly well," he said.
"When you talk to the taxi drivers, it's always a good indicator; they're optimistic and you get that optimistic feel."
Mr Joyce was appointed chief executive Qantas in 2008, having been the boss of Jetstar from 2003.