The most important factor here being, did you have the proper credits or fare category to entitle you to an upgrade?? On those occasion's when Customers have questioned this on-board, it was determined that 99.9% of the time despite status, the above was absent. I can only speak from experience, but employees who are upgraded into J are done so if they bear the proper eligibility/priority, and after the entitlements of revenue Customers are looked after.