The company has today issued the following statement:
"British Airways is extremely disappointed that Unite is planning massive disruption for hundreds of thousands of our customers over the Christmas/New Year holiday period.
"A 12-day strike would be completely unjustified and a huge over-reaction to the modest changes we have announced for cabin crew which are intended to help us recover from record financial losses.
"Unite’s cynical decision betrays a total lack of concern for our customers, our business and other employees within British Airways".