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Around 380,000 British Airways customers who used the airline’s website and app between Aug. 21 and Sept. 5 have had the complete details of their payment cards stolen in a massive data breach, the airline said. Customers who made bookings during this time period—which coincided with the airline’s summer sale—are being urged to keep a sharp eye on their bank statements and contact banks and credit-card providers if they see anything suspicious. Alex Cruz, BA’s chairman and chief executive, said: “We are deeply sorry for the disruption that this criminal activity has caused. We take the protection of our customers’ data very seriously.” Last week, Air Canada confirmed a data breach affecting 20,000 customers; in May, Delta admitted to two breaches during September and October last year.