They will start on June 16.
The strike is yet to be confirmed, however, as union representatives are "considering some new information," the spokeswoman said, adding that the union was now legally required to give two weeks' notice before action takes place.
Cabin crew members in the mixed fleet are in a long-running dispute over pay, and have been on strike several times already in 2017. The dispute predates last weekend's IT systems failure at British Airways which stranded 75,000 customers, and is not connected.
British Airways has previously said that it has been able to fly all customers to their destinations during strike action by members of the mixed fleet crew.
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