Are their KI Aces and how to identify them?

[Zacha78]

In offline campaigns, are there KI Aces, and if yes, how can I identify them? At the moment I am frustrated by a mission against a group of 6 P-39 which beat the heck out of my Me109-G6 and FW-190 friends (of course also because my friend-wings drop in by two planes every 2 minutes in the fight zone and thus are pretty outnumbered, dunno if their is much I can do about that than trying to time my appearance with at least one other wing), and there are two P-39s with no normal numbers, but one has the number 100 and the other 3 Letters similar to "PTA" (actually the T looks more like an upturned L) and I have the expression they are well above average. But that may be only imagination. Or are they aces?