An ace is a fighter pilot who has shot down five or more enemy aircraft. The rules for validating an enemy "kill" varied between countries. Some required a witness. Others were not so strict and the kills could be shared.
Eddie Rickenbakker
Eddie Rickenbakker.
the red baron
The first US flying ace in WW I was Eddie Rickenbacker.
I suspect you mean WW1 air ace - in which case the Red Baron, Baron Manfred von Richtofen is your man.
Eddie Rickenbakker
Yes, there were a bunch of them.
Eddie Rickenbakker.
the red baron
The Red Baron from Germany
The first US flying ace in WW I was Eddie Rickenbacker.
Eddie Rickenbacker
the red baron
Baron von richtofen
The Red Baron.
Usually five, depending on country.
Billy Bishop