Originally Posted by
zorn
These threads only make sense when someone who should have been seated in J (upgrade waitlist, standby J due to flight change, etc.) is not seated in J.
Otherwise it's a case of a busybody taking too much notice of where other people are seated.
I think you're being a little harsh. This thread makes perfect sense ever since AC made changes to their Altitude program and upgrade specifically aimed at making sure the J cabin is filled with pax paying to be there.
Unless the J passenger in question simply took a vacant seat in Y for takeoff, this is a pretty clear example of something AC should be aware of.