I recently purchased KLAX for FS9 and not all of the AI traffic are at their correct gates. What do I do to fix this?
The parking positions are all mostly correct (unless you were saying that yes, they are, except a few places, and you are disappointed because not "all" of them are 100% exact, which is obviously impossible within the AFCAD/AI system constraints).
If yours seems to be entirely wrong, the problem is not the scenery, but the AI pack you are using that is missing the atc_airline_codes in the AI aircraft.cfg. Since KLAS uses only generic parking types, it relies on the AI airplanes having the atc_airline_codes correctly set, otherwise they all park at random, depending on size only.