British Airways cabin crew with 30 years' experience say they fear losing their homes under a new pay deal.
The airline has told its longest-serving cabin staff they face a 20% cut in basic pay or they will lose their jobs.
Cabin crew fear that could amount to a 40% cut in real wages, if extras like meal allowances are also reduced.
BA says the cuts are needed to "protect jobs" and long-serving crew will keep at least 80% of their basic pay.
One crew member who doesn't want to be named told the BBC she will not be earning enough to pay her mortgage.
"I'm a 55 year old single parent, I've been in my house a year. My life has been built around the salary I have," she said.
The move is the airline's latest offer in ongoing consultations with Heathrow-based staff.
In an email sent last night, British Airways said the aviation industry would look "very different" after the coronavirus pandemic.
It said: "None of this is easy, but I hope [cabin crew] agree that this proposal offers a positive, permanent outcome to an impossible situation."
Under the plan, long-serving cabin crew will need to re-sign under new terms.
The airline says the new terms will bring longer-serving, better paid staff in line with newer recruits who are on "market-competitive rates".
Like all airlines, BA has seen massive cuts in revenue as governments restricted travel to stop the spread of the coronavirus.
The cabin crew member who spoke to the BBC pointed to the €1.7bn (£1.54bn) profit made by BA's parent company IAG, last year.
"We made the company billions in profit and frontline staff have seen none of it.
"I've saved a life, I've held a man's hand while he died, I've fought a cigarette fire in the toilet," she said.
"They're saying we'll guarantee you 80% of your basic salary - but my basic salary only makes up 60% of my [overall] salary.
"Staff should be an asset, instead they're being treated as a liability," she added.
British Airways has said up to 12,000 jobs could go from its 42,000 strong workforce, but consultations are continuing.
However, MPs have called BA's plans "a national disgrace".
A recent report by the Transport Select Committee accused the airline of a "calculated attempt to take advantage" of the pandemic by cutting thousands of jobs and downgrading terms and conditions.
Benefits 'chipped away'
Another cabin crew member who has worked for the airline since 1989 but also did not want to give her name, told the BBC: "We know we make a profit but people are being offered new contracts which won't allow them to pay their mortgages.
"They've chipped away allowances, holiday pay and even training," she said.
"The new crew members are being taken on at a young age, but not given the training in service that we were."
Currently the airline's Heathrow-based cabin crew are divided into three fleets or teams: the Worldwide fleet for long haul flights, the Eurofleet for short haul and the Mixed fleet.
BA plans to move all three teams into a new catch-all fleet, arguing that will be more efficient and save the airline money.
In the email to cabin crew, Amy James, BA's Head of Inflight Customer Experience said the plans would have a "significant impact on staff currently earning significantly more then the current market rate".
"Our proposal would guarantee that if you secure a corresponding role in our new team, we will safeguard your basic pay at at least 80% of your current rate.
"This pay protection proposal provides a 'soft landing' into a new aviation industry that's very different to what any of us have known in the past."
However, cabin crew who have spoken to the BBC have pointed out that much of what they earn comes in the form of variable allowances - paid on top of their basic salary - which are due to be replaced under the new scheme.
It is not clear how much they will be reduced. There are also likely to be significant changes to other terms and conditions.
Sources close to the company say staff should not see their pay cut by more then 30%.
British Airways has now promised that cabin crew will not lose more than 20% of their basic pay. It looks like a concession - there had been talk of cuts exceeding 60% - but how soft is the "soft landing" being promised by managers?
It isn't entirely clear. Basic pay is just one part of a cabin crew member's earnings. Staff on the so-called "legacy fleets" based at Heathrow make a significant chunk of their overall earnings from variable allowances.
These will certainly change under the cost-cutting plan, but it isn't yet clear what those changes will be. Other changes, to working patterns for example, are also likely to have a major impact on everyday life for many staff.
Company insiders suggest no-one will see a pay cut of more than 30% overall - and many lower-paid staff, particularly those who joined over the past 10 years, should see their earnings increase. They say cost-cuts are vital if the airline is to prosper in future.
But the threat to staff remains - if an agreement on the changes can't be reached, the company will force the issue - by handing staff their notice and offering them new contracts under different terms.
It's because of that threat that Unite and GMB are refusing to engage with the company. It has also, all too clearly, alienated many staff.
This offer may be an attempt to pour oil on troubled waters, but the reaction so far suggests it's unlikely to be effective.
Many of the Worldwide and Eurofleet staff joined BA years ago, before low-cost carriers such as Ryanair and Easy Jet disrupted the aviation sector.
The Mixed fleet was set up in 2010 after a bitter dispute between BA and unions.
Currently, Unite and the GMB are not engaging in talks with BA.