British Airways cabin crew have voted for strikes in a dispute over pay.
More than 2,000 workers were balloted about the action, which will take place at Heathrow, according to the BBC.
It comes after cabin crew rejected a 2% pay rise offer.
Unite has not commented on whether the strike would affect passengers travelling over the festive season.
Unite says earnings were advertised between £21,000 and £25,000 but in reality start at just over £12,000 plus £3 an hour flying pay.
British Airways parent IAG recently downgraded its profits forecast but is projecting to make €5.3 billion a year until 2020.
Unite regional officer Matt Smith said: “Our members have overwhelmingly voted for strike action because British Airways’ pay rates are indefensible and the crew are at breaking point.
The dispute concerns around 4,000 ‘mixed fleet’ staff who have joined the airline since 2010.
“Mixed fleet crew earn just over the minimum wage and below the national average,” said Smith. “Significant numbers of crew are taking on second jobs, many go to work unfit to fly because they can’t afford to be sick. British Airways bosses need to wake up to the anger and the injustice here.”
He added that the pay rates are “indefensible” and “a safety issue”
Unite said 79 per cent of the crew that took part in the ballot voted for strike action on a turnout of 60%.
A British Airways spokesman said: “We are extremely disappointed that the union is creating uncertainty for our customers.
“Mixed Fleet Unite represents about 15% of our cabin crew. We remain focused on resolving this issue as quickly as possible without any disruption to customers.
“We have proposed a fair and reasonable pay increase to Mixed Fleet cabin crew which is in line with that accepted by other British Airways colleagues and which will ensure their reward levels remain in line with cabin crew at our airline competitors.”