I am going YHZ - YYZ - YSB (all on AC). This is not a voluntary change, and I did not ask to spend overnight in YYZ. I purposely booked this in the afternoon, but AC is now offering me the option to leave early in the am. Why? It's AC's fault to cancel the flight from YYZ.
There is a flight available in the afternoon, which suits me, but AC is not willing to change me to that flight.