Chase seems to be one of Air Canada's credit card rewards program partners[1]. My guess is that this relationship has something to do with Chase's refusal to issue a chargeback.
[1]https://www.aircanada.com/us/en/aco/home/aeroplan/credit-car...
[1]https://www.aircanada.com/us/en/aco/home/aeroplan/credit-car...