According to an announcement made on their web site, personal and payment card information of 380,000 British Airways customers were stolen from users making bookings on its website and app from 22:58 BST August 21, 2018 until 21:45 BST September 5, 2018.
The stolen information included name, address, email address and credit card information; it did not include travel or passport details
The airline confirmed that the breach has been resolved, and its services are now operating normally.
In March 2015, British Airways Executive Club member accounts were hacked, however that wasn’t considered a data breach, because hackers used information available in the underground.
Read more about it here.