As the investigation is not yet completed, air carrier says almost 380,000 customers personal data and financial data were affected on this data theft. But at the meantime, Airways have patched the vulnerability and notified to the relevant authorities.
On the notification post, British Airways says -
"We will be contacting affected customers directly to advise them of what has happened and are advising them to contact their banks or credit card providers and follow their recommended advice,"British Airways have restored their system and all the operations are running normally, but they also notify its all users to immediately change their passwords and also contact to the respective banks.
We are investigating the theft of customer data from our website and our mobile app, as a matter of urgency. For more information, please click the following link:https://t.co/2dMgjw1p4r— British Airways (@British_Airways) September 6, 2018
The chief executive of British Airways has promised to compensate customers who have had their data stolen in what he described as a sophisticated breach of the company’s security systems.