Originally Posted by Stranger

Do I understand this right? The OP wants to buy a ticket on the same flights as his wife's Aeroplan ticket?

Isn't that the simplest thing in the world, or do I miss something?

On two instances of the browser check on Aeroplan and aircanada.com. Find availability on Aeroplan. Check price of revenue ticket on aircanada.com.

Complete the aeroplan ticket purchase and complete the aircanada.com one. Or probably better the revenue ticket first since there is a 24 hours grace period with free cancellation.