British Airways is set to cut up to 12,000 jobs from its 42,000-strong workforce due to a collapse in business because of the coronavirus pandemic.
The airline's parent company, IAG, said it needed to impose a "restructuring and redundancy programme" until demand for air travel returns to 2019 levels.
The pilots' union Balpa said it was "devastated" at the news and vowed to fight "every single" job cut.
IAG also owns Spanish airline Iberia and Ireland's Aer Lingus.
In a statement, IAG said: "The proposals remain subject to consultation, but it is likely that they will affect most of British Airways' employees and may result in the redundancy of up to 12,000 of them."
The company said it will take several years for air travel to return to pre-virus levels, a warning that has been echoed by airlines across the world.
Alongside IAG's statement, BA chief executive Alex Cruz wrote in a letter to staff: "In the last few weeks, the outlook for the aviation industry has worsened further and we must take action now. We are a strong, well-managed business that has faced into, and overcome, many crises in our hundred-year history.
"We must overcome this crisis ourselves, too. There is no government bailout standing by for BA and we cannot expect the taxpayer to offset salaries indefinitely... We will see some airlines go out of business."
About 4,500 pilots and 16,000 cabin crew work for BA, which has already put almost 23,000 staff on furlough.
Balpa's general secretary Brian Strutton said: "This has come as a bolt out of the blue from an airline that said it was wealthy enough to weather the Covid storm and declined any government support.
"Balpa does not accept that a case has been made for these job losses and we will be fighting to save every single one."
Global impact
Also on Tuesday, IAG revealed the impact of the virus outbreak on group revenues. In the first three months of 2020 revenues fell 13% to €4.6bn (£4bn). Worse is to come warned Stephen Gunning, IAG's chief financial officer.
Airlines across the world have warned they face a fight for survival.
In the UK, EasyJet has laid off its 4,000 UK-based cabin crew for two months. And Sir Richard Branson has appealed to the government to help bail out his Virgin Atlantic airline with a loan thought to be up to £500m.
Elsewhere, Qantas has put 20,000 staff on leave, while Air Canada has done the same for about 15,200 employees. Norwegian Air has said it could run out of cash by mid-May. At American Airlines, about 4,800 pilots have agreed to take short-term leave on reduced pay and more than 700 are taking early retirement.
Source: BBC
BDST: 1609 HRS, APR 29, 2020
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