You can choose NIKI from the AC selection list  but it doesn't not load/show  in the loadout hangar
You can however still fly it.
When Flying NIKI artificial horizon is fubared
On other topics.
Wings on Ta 152 are impervious to being ripped off regardless of speed/stress
Freeze-ups on merge. (seems to be a common complaint)
Frame rate better then Beta 19  but wildly unstable with sometimes 20 FPS variation
Was getting a relatively stable FPS with beta 17 with Frame rates that ran between 57 -61 FPS
beta 18, FPS dropped to 20-35 (when I was lucky)
beta 19 framerate as I said is wildly unstable and run between 27-45 and occasionally up to 55
Blocks of terrain rise above terrain. Most noticeably when looking to either side.
Other stuff while perhaps not bugs are bugging.
Sea is much too  dark, sky is too light, almost white. unless a hazy day sky effect is what is trying to be achieved  in which  case then the sun is too bright (intense) when looking at it
Smoke from tracers/cannon rounds is still too thick too pronounced and does not dissipate quickly enough. Try halving its size and making it go away faster Its also not transparent enough
(Watching period guncam films confirms this)
The spiraling smoke tracers from GV guns same problem  and while cute for the first two minutes or so gets  very annoying after that LOL
Nice psychedelic effect though 
Running  at 1024x768 with everything set on high and to favor graphic quality
System specs
AMD ATHOLON XP2100+, MMX, 3DNOW ~1.7 GHZ
MOTHERBOARD: ASUS A7V333 motherboard
 Award Modular BIOS V6.0
512MB Corsair DDR333 RAM
128MB PNY Verto nVidia  GeFORCE FX 5200 AGP (with latest drivers)
display mode of 1024x768
Sound Blaster  Live! 5.1 soundcard
WinXP Professional
DirX 9