Some 20,000 Air Canada customers woke up Wednesday to learn their personal information may have been compromised after a breach in the airline鈥檚 mobile app, which prompted a lock-down on all 1.7 million accounts until their passwords could be changed.

Air Canada said it detected unusual login activity between Aug. 22 and Aug. 24 and tried to block the hacking attempt, locking the app accounts as an additional measure, according to a notice on its website.

Mobile app users received an email Wednesday morning alerting them as to whether their account had been affected.

The app stores basic information including a user鈥檚 name, email and phone number.

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Any credit card data is encrypted and would be protected from a breach, Air Canada said.

But Aeroplan numbers, passport numbers, birth dates, nationalities and countries of residence could have been accessed if users saved them in their account profile, the company said.

Air Canada declined to respond to questions, referring The Canadian Press to its website.

The risk of a third party obtaining a passport in someone else鈥檚 name is low if the user still has their passport and supporting documents, according to the federal government.

Users can reactivate their account along stricter password guidelines by following instructions emailed to them or prompts when logging in.

Some users reported problems with the process on social media, likely due to the volume of customers trying to unlock their account.

Air Canada advised anyone looking to access the app to keep trying.

The Canadian Press

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