In my example, it's a revenue latitude fair. Although , that should not normally affect the result.


I know that people will then start lloking at expert flyer and fare base or R space availabiltiy etc etc etc....

As an end user , if I see "seats available for upgrade " , I base my decision on that, book the flight and want to execute the upgrade immediately.
AC does not honor what the end user sees on the web site in black and white.