Originally Posted by DubWannabeNerd
I ask as I am planning a trip to YYZ with AC and if there is an option to book it with EI and get points/lounge access then I would be interested and may hold off booking if it were imminent.
Welcome! Even if EI and AC sign a codeshare agreement, a codeshare does not automatically mean there will be a frequent flyer agreement. For example, I don't think you can yet earn Gold Circle points on EY operated flights.