Sean Doyle, the Aer Lingus chief executive and chairman, is to become the new chief executive of British Airways.
In a statement this morning, IAG - which owns both Aer Lingus and British Airways - said that BA chief executive Alex Cruz is to step down from the role. However, he will remain on as the airline's non-executive chairman.
Meanwhile, Donal Moriarty, chief corporate affairs officer at Aer Lingus, will become the airline's interim chief executive.
A permanent appointment will be announced in due course, IAG said.
Sean Doyle worked at British Airways for 20 years before moving to head Aer Lingus nearly two years ago. He will also take over the BA chairman role after a transition period.