models (and also UT traffic models) might be a bit rough around the edges but they give very good fps when used in large numbers (like around the London area and NY for example), AI
aircraft are always a bit of a compromise between level of detail+ quality of the liveries and frame-rates.
Other problems (certainly with some of the WoAI
models) with the aircraft are their unrealistic/erratic flying behaviours whereby they might seem to fall out of the sky during short final and problems with the vertical speed at landings which can be so fast that the aircraft seem to fall through the runway on touchdown and subsequently disappear.
other good models are
for the 744 and 777 and all Airbii
SKJ for most of the Russian models (good frame-rates ,excellent eye candy)
(Nic Black's AI
) for a lot of military models
for F16 and some GA
UKMIL most for European/British military models (heavy on the frame-rates though)
For Ships used as AI
you might want to look here; http://fs-shipyards.com