Unless the flight doesn't have wifi right. in which case AC could have issues with you using BT.
Clearly if you want to talk Y seats at the back of the aircraft work well

I think premium class must refer to J (Business class) here, but as Air Canada is 1-2-1 on a pod level it's either two window or middle seats really. And two window seats aren't that conductive to having a long chat imo.
Doesn't the divider have to be down for take off and landing anyway?