It is also officially posted on AC.com:
https://www.aircanada.com/ca/en/aco/...ac-action.htmlAugust 27, 2024

Air Canada is in negotiations with the Air Line Pilots Association (ALPA). Currently, our operations are not affected, and our flights are operating as scheduled. However, if you want to make alternate travel arrangements, we’ve implemented a policy that allows you to change your flight for free if:

• You purchased an Air Canada ticket no later than August 27, 2024, for travel between September 15 and September 23, 2024.

If you’re scheduled to travel during the affected period, you can retrieve your booking to change your flight, free of charge, to another date:

• between September 8 and September 14, 2024, and/or
• between September 24 and November 30, 2024.

We will notify customers of any impact to their flight itinerary in advance of their travel.