The cyberattack targeting the personal data of customers with Qantas is the latest in a string of breaches affecting millions of Australians, as hackers target major companies and exploit weak spots in the systems they rely on.

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

Australian airline Qantas says a data hack on Monday exposed the personal information of six million customers and it expects the amount stolen to be “significant.”