[Costco] 4x Aeroplan miles on Costco.ca with promo code AERO4

Earn 4x Aeroplan miles on Costco.ca purchases between Aug 5, 2019 to Aug 18, 2019 by using promo code AERO4.

https://www.costco.ca/aeroplan.html

Make sure you link your Costco membership to your Aeroplan account here before purchasing: https://www.costco.ca/aeroplan-registration.html

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