Australian airline Qantas disclosed that it detected a cyberattack on Monday after threat actors gained access to a third-party platform containing customer data.

The hack of the Australian carrier follows recent incidents at Hawaiian Airlines and Canada’s WestJet. Here’s what you need to know. Qantas said on Wednesday it is contacting customers after a cyberattack targeted a third-party customer service platform that stored the personal data of 6 million customers.