This isnt one of my achievements, but back when I was in the Nightmares, we were in an FSO, and Filth comes over vox and tells us that he sees an entire squad of 262s refueling at some airbase with no significant fighter support covering them. I forget what planes we were in that night, but he had eggs and i think he ended up with 6 262s in 1 pass.
Then there was the time our squad gunned down a CV with P40s during an FSO....the event forums were not a very hospitable place for us for a while after that!
Whenever I think of my favorite moments in this game, its always FSO or scenarios. So many great memories from both Air Warrior and Aces High.