SABOTAGE was suspected when two BA planes were crippled by foam.
Five tons of fire retardant covered the jets in a hangar at Heathrow on Sunday.
The Boeing 777 and 787 planes will be out of service for months after their fuselages were damaged.
And the final clean-up bill is expected to cost the airline hundreds of thousands of pounds.https://tpc.googlesyndication.com/safeframe/1-0-37/html/container.html?n=0
The finger of blame was originally pointed at disgruntled BA staff facing either redundancy or agreeing to contracts with less pay.
At least 931 engineers, some of whom were at the scene, are among the 12,000 staff getting the boot.
But British Airways has insisted a technical issue was to blame.
An insider told The Sun: “There’s a lot of p***ed off people at BA at the moment and suddenly two of their jets have been ruined.
“Suppressant foam is not easy to clear up. This mess is going to take weeks to sort out. It’s ruined the tools, aircraft, everything in sight.
“BA staff claimed sabotage. There is so much anger.”
But an airline spokesman said: “One of our fire prevention systems experienced a technical issue, causing foam to be dispersed.”
Union chiefs have slammed plans for new zero-hours contracts.
BA and Virgin Atlantic staff are expected to join a demonstration outside Parliament tomorrow.