So "left the factory" is only a red herring? Really doesn't mean anything?
How do we define "saw service"? Just trying to keep up with the debate.
As for my personal view for inclusion, my "ideal" is "operationally deployed". By that I mean deployed in at least squadron strength in "combat ready" status (included in the air order of battle), with a full roster of trained pilots (normally more pilots than planes) and supported by the maintenance/logistics system. That's what
I would use for inclusion. YMMV.

Also, I wouldn't perk anything.. not even the 262.

My signature block says it all.

Who am I to tell you how to enjoy yourself?