Originally Posted by
Will_YYT
I went on the AC website and looked under preview seats!
The seat map does not represent the number of seats available for sale, nor does it represent the number of seats available for upgrade. It simply shows you which seats on the plane have and have not been pre-selected by passengers with tickets. There needs to be positive space for upgrades which you can check on other sites such as Expertflyer.com. As has been pointed out above, you are looking for R space.