London (CNN Business)Alex Cruz is stepping down as chairman and chief executive of British Airways as its owner, International Airlines Group (IAG), reshuffles top management to tackle the worst crisis in aviation history. Sean Doyle, the CEO of Irish airline Aer Lingus, which is also owned by IAG, will become chief executive at British Airways with immediate effect and also take over from Cruz as chairman after a transition period, IAG (ICAGY) said in a statement on Monday. Doyle worked at British Airways for two decades before moving to head Aer Lingus nearly two years ago. Donal Moriarty, the chief corporate affairs officer at Aer Lingus, will become interim CEO while a permanent replacement is found, IAG said. Its stock fell as much as 2% in London on Monday before paring back some losses. Major airlines, including British Airways, have cut thousands of jobs and trimmed their fleets in the expectation that international air travel won't recover to the level it was at before the pandemic hit until at least 2024. Low-cost carrier EasyJet (ESYJY)said last week that it expects to suffer its first annual loss in its 25-year history. "Sean Doyle will have his work cut out to make immediate progress given that British Airways is facing the toughest challenge in its history as demand for international travel has plummeted and quarantine restrictions continue to constrain bookings," Susannah Streeter, a senior market analyst at Hargreaves Lansdown, said in a research note on Monday. British Airways warned in April that it may have to cut up to 12,000 jobs, but has since said that about 10,000 employees — or more than a fifth of its workforce — will be leaving the company, the majority through voluntary redundancy. The carrier is retiring its entire fleet of Boeing 747s four years ahead of schedule. Last month, IAG's shareholders, including Qatar Airways, approved a $3.3 billion capital raise to help the group weather the storm.