FSX/P3D. If you haven't tried them yet, I highly recommend the general aviation AI traffic packs from Orbx. Easy on frames, well detailed, and populated with aircraft appropriate for the regions they cover. The next update in development covers Redding (KRDD) and Benton Field (O85) with GA, corporate jets, and Fire Attack AI. FTX NCA is currently the hottest thing on the market, if you haven't discovered it yet, you are missing out. The ADX review is inbound too! Get it via the source link.