The union representing British Airways' cabin crew says cuts the airline wants to make go "too far".
Unite says that BA is increasingly likely to face strike action this autumn.
It argues that staff who keep their jobs at the airline face contracts which provide no stability or security.
They also involve pay cuts of up to 43%.
Unite first threatened BA with strike action in July.
But after a union meeting on Thursday (Aug 20), a spokesman said he would instruct lawyers to proceed to industrial action.
That would need to be approved by a vote though, and is likely to be some weeks away.
But it's an additional headache BA doesn't need.
Owned by IAG, Britain's flagship carrier is battling to survive after the crisis paralysed international travel.
It has been burning through 20 million pounds a day, or over 26 million dollars.
And has said it needs to axe up to 12,000 jobs.
While flying restarted in Europe in June, new restrictions continue to be imposed.
On Thursday, Britain brought in quarantine rules for Austria and Croatia.
It creates a fresh problem for travel demand in markets served by BA.