More British Airways workers at Heathrow Airport have voted to go on strike during the coming summer holidays.
BA workers at the London hub who are members of the GMB trade union voted 95% in favour of industrial action this summer.
Earlier this month, the Unite union, which represents 16,000 BA employees, began balloting its members too, with the results expected on Monday.
If Unite members also vote for strike action, the result could see more than 700 of the airline's check-in and ground handling staff walk out during the summer holidays.
Both unions say that the airline, which is part of FTSE 100-listed (International Consolidated Airlines Group SA (LSE:IAG)), "brutally cut" pay during the pandemic, then while it restored managers’ pay to pre-Covid levels it has still had not reversed the 10% pay cut issued to standard workers.
Unite also insisted thousands of staff were dismissed and not replaced, which partly caused staff shortages in recent months.
A BA spokesperson said staff were offered a 10% payment for this year and the company is "fully committed to talks with our trade unions about their concerns and we hope that together we can find a way to reach an agreement in the best interests of our people and our customers".
Unite said that after two years of job and pay cuts, customers and staff are "paying the price through sky-high ticket prices, rock bottom service levels and non-existent morale", with staff "no longer willing to excuse, or pay the price for, poor management decisions".
British Airways is the owner of 51 of the available 'slots' at Heathrow.