I am travelling on the 0250 DXB - LGW early Friday morning. (Message me if you want F lounge access).

I am on a J class ticket and there are no empty seats. If I check in now will it hamper my chances of an upgrade to F? I am a Platinum travelling solo with zero tier mikes. I once heard that if you are not checked in it is easier for them to upgrade you straight away without staff de-booking and re-booking your ticket... But i'm not sure if there was any truth in that.

Can anyone offer any insight?