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.

The Qantas airline company announced Wednesday that data belonging to six million of its customers has been hacked.

A cyber hacker broke into a database containing the personal information of millions of customers, Qantas said, in Australia's biggest breach in years and a setback for an airline rebuilding trust after a reputational crisis.