I cannot answer that, and I will tell you why.
Air Canada is not required to provide service in both official languages across Canada. It is required to do so in certain regions, such as Quebec and Ontario, and at certain airports, those that receive more than a million passengers a year, I believe. Furthermore, surveys are conducted regularly to determine the percentage of the francophone population that travels by air.
I do not know whether the route you referred to is considered a route on which bilingual service must be provided.