WestJet says some passengers' personal information was obtained in a cyberattack in June, however it believes the breach did not involve "sensitive" data in most cases.

The airline issued a notice to U.S. residents on Monday related to its ongoing probe into the June 13 incident, which it said was carried out by a "sophisticated, criminal third party."

It said its internal precautionary measures prevented attackers from gaining customers' credit card and debit card numbers, expiry dates and CVV numbers, and that no user passwords were stolen.

However, some passengers' personal information was exposed, such as their name, contact details, information and documents provided in connection with their reservation and travel, along with data regarding their relationship with WestJet.

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