Upgrade is authorized at check-in for non-rev only if the Economy Class is full.
In hat case, non-rev are upgraded in priority before paying passengers.
Priority rule for upgrading is :
1) R1 (AF Staff with a reserved ticket)
(AF Staff with a Stand-by ticket)
(No fare ticket, for AF
Pilots and F/A. Only on dometic & European network)
Air rance Group (Brit'Air / Regional / KLM Saff)
Introduce yourself to the Chief Purser and/or Captain when boarding. That's normally the rule for us (AF Saff) especially if you are not upgraded at check in.
We upgrade Non Rev staff on board if seats available in J very often (even if we are not supposed to do it ...