While I wouldn't entirely disagree with you John, I think you have to be careful about using AC that are 'non-AI' ie:UI aircraft. The reason being that AI models are low poly versions and therefore much more frame rate friendly. I'm really thinking that if you have a lot of traffic then your PC will come under some strain regarding frame rates especially if using some good modern sceneries. Some user AC like Mike Stones stuff are fairly light on FR's but for a lot of traffic then AI models that are made specifically for AI traffic from AIA, TFS etc. are really the only way; and, of course, th