https://www.bleepingcomputer.com/news/security/air-canada-mobile-app-users-affected-by-data-breach/

Air Canada informed today 20,000 of its mobile app users that information listed under their profile may have been accessed without authorization.

Between August 22-24, the company noticed unusual login activity and responded by stopping the attempts. To protect customer data, Air Canada locked all its 1.7 million mobile app accounts.