Here's mine:
Variable from 25 to 35 fps, with about 40 fps when no terrain behind. When I'm not recording with fraps, there's a mean increase of about 5 fps. In hardest explosions, fps fall to 10 for only a second. Sound of engines is missing, but that's a general track minor issue, In flight there's sound with no problems.
My config (spanish; Alto = Hight, Medio = Medium, Bajo = Low):
Pc:
I7 920 overclocked at 3,33Ghz
6 GB RAM DDR3
Nvidia GTX275
Win 7 Ultimate 64 bits