Chief Executive Alex Cruz said Friday the company is "100 percent committed" to compensating customers whose financial information was stolen. He said the company had been hit by a "very sophisticated malicious criminal attack."
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He said enough information was stolen to allow criminals to use credit card information for illicit purposes, and that police are investigating.
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"We know that the information that has been stolen is name, address, email address, credit card information; that would be credit card number, expiration date and the three-letter code in the back of the credit card," he told the BBC, adding that no passport data had been hacked.
The company's mobile app was also breached, officials said.
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British Airways revealed the hack Thursday evening and began notifying customers. Customers who booked on the company website from Aug. 21 until Sept. 5 may have been affected.
The hack was not discovered until Sept. 5 and has now been resolved, officials said.
Shares in BA's parent company, IAG, were down 2 percent on Friday.