Australian airline Qantas said Wednesday that a hacker made off with a trove of its customers’ personal data including passenger names, emails, phone numbers, birth dates and frequent flyer numbers.

Qantas has confirmed a major data breach which may have affected six million customers.  In a statement on its website, the airline said it detected unusual activity on a third-party customer service platform used by a Qantas call centre on Monday.

Qantas is contacting customers after a cyber attack targeted their third-party customer service platform. On 30 June, the Australian airline detected "unusual activity" on a platform used by its contact centre to store the data of six million people, including names, email addresses, phone numbers, birth dates and frequent flyer numbers.