BALPA's British Airways members are to strike on 9, 10 and 27 September.
The UK pilot union says its attempts to resolve an industrial dispute with IAG-owned BA have been rebuffed. The airline's latest offer is unacceptable to BALPA members, it adds.
"In these circumstances, with a 93% vote in favour of taking industrial action, and with no prospect of any further meaningful talks, we have no choice but to call this action," says the union.
BA responds that it is "completely unacceptable" for BALPA to disrupt the travel plans of tens of thousands of passengers.
"We are extremely sorry that after many months of negotiations, based on a very fair offer, BALPA has decided on this reckless course of action," says the airline.
As a result of the strike, BA is looking to amend its schedules to maintain as many flights as possible, although it is "likely that many of our customers will not be able to travel". It is also examining the possibility of wet-leasing capacity and crew from other airlines, as well as scheduling larger aircraft from its partner airlines.
Flights on BA CityFlyer, Sun-Air and Comair are not affected, BA stresses.