I saw a similar post in AGW a year or so ago.
Who is your nemesis in Aces High? in other words which pilot really has your number, gives you the most trouble, or you just cannot kill? You don't necessarily have to dislike them.
For me, I have two,
Nathbdp and
Citabria. It seems every time I encounter these jokers I do my absolute worst flying. They pretty much kill me every time we meet on equal terms!
Citabria and I used to fly H2H in WB's, I considered us pretty equal at that time, but in this game he has mastered the flight model much better than I have.
I had a ladder duel with nathbdp a few months ago. It was the first time I have ever been shut out in a duel. It was a really humbling experience. At first I told myself something wasn't quite right, then it settled in that he just flat out spanked me!
Fargin bastiges. They shall pay!

Anybody else?