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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
Artificial Intelligence (AI) Air & Sea Traffic
AI Flight Planner AI Flight Planner from Stuff4FS is a fully-integrated, TTools format-compatible AI flight planning tool for Microsoft Flight Simulator. Aircraft may be assigned directly from MSFS aircraft folders. AI Flight Planer
AI Tracker X A great payware AI tool for FSX or P3D. It offers multiple modes, easy formation flights, recording & playback. Follow AI using an invisible camera etc.  Lorby SI logo
AI Traffic Mover AITM includes several tools to make FS AI Traffic even more realistic. With AITM it's easy to rearrange, move, export, analyze, and edit aircraft. You can create projects with different flight plans and merge them. New version. AI traffic Mover
AirNav FS Live Traffic Award winning, program and "subscription service" that loads specific AI traffic based on real word schedules and FAA data combined with a version of My Traffic X. For FSX. Now described as "legacy". AirNav FS Live Traffic
Airport AI Enhancer Gunnar Daeling's Airport AI Enhancer (Freeware) helps you to fix the problem of empty aprons at your favorite FS9, FSX and P3D. Also has other utilities. Airport AI Enhancer
Alpa India Group (AIG) AIG are a group of Flight Simulator fans who want to put the fun back into AI. Aircraft models including Antonov, Boeing, McDonnell Douglas, CRJ etc, repaints, flight plans and AFCADs. Forum. Also have a Facebook page. AlpaIndia
Adobe's Cutting Sky Korean site offering some Korean AI traffic resources and aircraft repaints for FS9 and FSX Adobe's Cutting Sky logo
Doug's Flights of Fancy AI repaints and some interesting flight plans and AFCADs for statics at various location, civil and military, including the famous airliner boneyard at Kingman Airfield, Arizona. For FS9. Also videos and links. Doug's Flights of Fancy
FLAi Was a complete AI model matching package featuring your favorite aircraft and airlines for VATSIM in FSX and P3Dof FSX and P3D. No longer available - see statement on website and Facebook page... FLAi
Flying Carpet Hub A huge selection of detailed repaints for FSX & P3D AI aircraft. Includes liveries of Hong Kong Airlines, Royal Air Maroc, FedEx and many others. Also AI flight plans and call signs and links. Contains a detailed painting tutorial. Flying Carpet Hub
FS Reborn This free add-on fixes the missing AI traffic nav lights in P3D V4 (AI strobe lights invisible at distance, nav light orbs, ugly lights, etc.). Also enables special effects for  AI Traffic. Check out the low-cost Pro version for  extra features.
Global AI Ship Traffic Thread on AvSim about the freeware Global AI Ship Traffic project by Henrik Nielsen & team. The thread is long, so make sure you find the latest news & support info. A number of files are needed. A similar thread on FlightSim.Com Global AI Ship Traffic
HTAI Models Henry Tomkiewicz's AI models. A large range of  civilian and military AI models. Also the payware Cessna Project containing models of over 50 single-engine props from various eras of Cessna's production history. Mainly for FS9.
Juergen's paint hangar A large collection of detailed repaints for FSX & P3D AI aircraft including rae and unuslal liveries. Includes collections from Marco and Nils.
MAIW MAIW (Military AI Works) produce packages of military AI aircraft. Aircraft and Sets cover many countries of the world and offer a huge range of aircraft from fighters, to heavy lift, to helicopters. 
My Traffic X Professional My Traffic X Professional enhances FSX and Prepar3d with realistic, worldwide AI traffic. Includes airliner, general and military traffic, flying millions of weekly flights and an traffic editor.  Version 6.0 released. Forum. My Traffic X Professional
With PSXseeconTraffic (PSXT) you can fly world wide with real live traffic in P3D or FSX. Flying in live traffic gives you an awesome immersion. See the manual for additional resources needed.
Retro AI Traffic Group Source of vintage flight plans, AFCAD files, and resources. Flight plans are meticulously developed using the finest resources and tools to ensure quality and realism. Web site is down, see forum for screenshots and links to files. Retro AI Traffic Group
Seafront Simulations Overhaul the default global AI leisure, cruise and cargo traffic with high quality, night lit, PBR sailing yachts, catamarans, yachts, fishing, cruise and cargo ships! Also enhanced shipping routes from real-world, global AIS.
RealTraffic RealTraffic consolidates data from several international networks of real airplanes near the position of your simulated aircraft - in realtime, live! It then injects this traffic to your flight sim so you can fly with it, or follow it.
Traffic Board

Airport style flight info board for FSX and Prepar3D that supports all AI packages. Real time advanced information including actual airport names, runway and distance from airport. Displays all AI flights inc. military and GA. Super Traffic Board
Traffic 360 (Traffic X) Information on Just Flight's Traffic 360 for FSX and Prepar3d. It features over half a million AI flight plans, over 2,400 aircraft variants, a host of utilities and innovative functionality to control and monitor your AI traffic.  Discontinued Traffic 360 (Traffic X)
Traffic Global (by Just Flight) Traffic Global is the latest incarnation in Just Flight's Traffic series and features thousands of detailed but FPS-efficient commercial airline and general AI aircraft. Currently only an Early Access edition is available.
Ultimate Traffic II Redeveloped from the ground up, Ultimate Traffic 2 pfrom Flight 1 rovides FSX users the definitive answer to their AI Traffic needs. The project is a culmination of over three years of research and development. Forums for all versions. Ultimate Traffic II
United Traffic Team (UTT) Freeware and payware AI models and AI re-paints in many international liveries. Also have AI flight plans and AI helicopters and also a few rare repaints for popular payware flyable aircraft for FS9 and FSX. United Traffic Team (UTT)
World of AI An independent group of enthusiasts whose aim was to provide high quality AI traffic packages to enhance FS9 and FSX.  Last updated in 2017. World of AI