https://www.cnet.com/news/heres-how-british-airways-was-hacked-according-to-researchers/

In only 22 lines of code, hackers took on the UK's largest airline and stole data from up to 380,000 people.

But the hackers behind British Airways' data breach left behind a trail of evidence showing just how the major airliner had suffered its cyberattack, said researchers from cybersecurity firm RiskIQ.