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.”

The hack of the Australian carrier follows recent incidents at Hawaiian Airlines and Canada’s WestJet. Here's what you need to know.

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.