My best score lately has been in the D9, with the Yak3 running a close second. However I seem to do my best flying in an FM2, even though my survivability is more like 2 kills for every death rather than my usual 3. I've won 3v1 engagements in the FM, and even if I don't win while outnumbered, I can usually take down 1 or 2 planes out of the mob before they get me. In part this may be to the confidence the plane instills in me, at least from a defensive point of view. Its small size makes it hard to hit, and it can soak up a huge amount of damage. It will out-turn almost anything, and most other players tend to underestimate it. All of these factors combined make it one of the most fun rides to fly, if you know how to use it.