British Airways has berated union representatives after cabin crew voted strongly in favour of industrial action, which is set to begin in a week's time.
The airline describes the Unite union's decision as "cynical" and says it "betrays a total lack of concern" for customers and employees.
Unite has outlined plans for a 12-day strike from 22 December, which could cause huge disruption to passengers travelling over the Christmas holiday period.
BA says it is "extremely disappointed" over the matter. The strike centres on amendments to working practices which were brought in last month.
"A 12-day strike would be completely unjustified and a huge overreaction to the modest changes we have announced for cabin crew which are intended to help us recover from record financial losses," adds the carrier.
It has not directly responded to the union's offer to engage in talks to prevent the disruption.