I lost one a few months ago on a EWR-SAT leg of a SAT-LGW run. The EUA cleared while I was in the air between LGW & EWR (didn't know it at the time). I should have been suspicious because when I checked in at the gate my assigned seat had become "unassigned". I ended up in a non-reclining exit row whilst the lovely folks at EWR apparently gave my FC seat to someone else. I found an EUA email when I got home the next day.