Where can I add my Aeroplan membership to I can accumulate miles at the same time??
You can add it during check-in. However, you will not earn any marriott rewards elite credit or points if you do this. It is one or the other.
You can change it on the website on the Profile page. There’s a Earning Preferences section where you can choose between earning Points and earning Miles. Selecting Miles will let you select Aeroplan and put in your number.
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