Based on the subject line and a post on page 1 from 2011, this thread is about Air Canada cancellations or changes (or was).
There is also this new thread about Aeroplan changes
2019 Aeroplan Reward Changes - one stop / open jaw
To make things easier going forward, perhaps we need 2 distinctly or clearly titled threads, one for Air Cnaada tickets and one for Aeroplan tickets.