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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
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Aircraft Modellers G-Z
Golden Age Simulations Golden Age SimulationsModels of older aircraft for FSX and P3D with precision flight dynamics. Payware and freeware. Recent releases include the DeHavilland Moth, Curtiss Robin, Aeronca C3, Waco UPF-7 and Super Stearman.
Got Friends Formerly GotGravel. A collection of very nice and popular payware and freeware models for MSFS. Includes F4F-4 Wildcat, MonsterNX Cub, DoubleEnder, EA-7 Edgley Optica, Gee Bee R3 Special, Fokker DR.1, Savage Carbon, Savage Gravel with 35" Alaskan bush wheels and Vertigo.
Headwind
Simulations
Discover the excellent Airbus A330-900neo for MSFS by Headwind Simulations. Airbus A330-900neo and Sukhoi SuperJet 100-95 are available, with other models under development. Download directly from their website or use their installer available from the website along with other resources.
helisimmer helisimmerNews, information, reviews, articles and tutorials for those interested in helicopter simulation using MSFS, P3D, Flight School and x-Plane. Also carries a small collection of helicopter downloads.
Historic Jetliners Group Historic Jetliners GroupBoeing 707 aircraft, BAe-146 and DC-8s in all versions and series, plus panels. Also, many others from the first-generation civil jetliners era. Flight dynamics, sounds, panels, and effects. For FS9 and FSX.
Hype
Performance
Group
Offer Airbus HPG H145 and H160 helicopters for MSFS. The Base Pack features highly detailed models, textures, animations and Airbus Helionix avionics. and 4-axis Autopilot. An optional Action Pack Extension offers additional variants enabling the simulation of Helicopter Emergency Medical Services (HEMS) and Search & Rescue (SAR) operations. Also on flightsim.to...
iFly iFlyThe iFly Boeing 737NG and 747-400 were some of the most sophisticated add-ons for FS9, FSX & P3D. The accuracy of cockpit and system simulation is very high, and it has many features. Payware. The latest news is on their forum here...
iniBuilds Sell a couple of high-fidelity aircraft for MSFS from an in-house development team - the Bf 108 Taifun and P-40F WarHawk. They also sell a collection of aircraft from many other developers, including Bear Studios, FlyBoy Simulations, KwikFlight, Project Stratdevelopmentosphere and many more.  
LatinVFR Developer of popular Airbus models for MSFS. Airbus A318, A319ceo, A320ceo A321neo, Airbus A330 and the A340. Systems and flight decks are built on the default Asobo A320neo and modified to implement additional systems such as ECAM takeoff and landing memos, other ECAM messages, wing flex, etc. They also produce airports for MSFS, FSX and P3D.
Leonardo Software The latest version of a flight sim classic, Fly the Maddog X.  The MD-82  Base Package and MD-83 & MD-88 Expansion Pack aircraft feature advanced, study-level systems such that they can be flown by following the operations manual of the real aircraft. Variaients for P3D and MSFS. Forum...
Lionheart Creations Ltd Lionheart CreationsDeveloper of several payware aircraft packages for FS9, FSX and P3D. Includes Avelina, WT-9 Dynamic, Epic Victory executive jet, Dragonfly G-200, and for MSFS Bücker Bü-131 Jungmann, Trinidad TB21 GT Turbo and the American homebuilt Quickie Q-200 and others.  Facebook page...
Majestic Software Majestic SoftwareThe MJC Dash 8 Q400 serves simmers and airlines operating this aeroplane, with its challenging cockpit instruments offering a close to 100% correct system simulation. Available in 'Pilot', 'Training' and 'Pro' editions.
Nemeth Designs Nemeth DesignsA flight simulator addon development group specialising in realistic helicopters. Information about released and upcoming projects and patches/fixes for the payware products and some freeware. Mostly for FS9, FSX and P3D. Active forum.
PMDG PMDGPrecision Manuals Development Group is a small team of developers who bring a strong suite of skills to aviation simulation development. Products include the Boeing 737, 737NGX, Boeing 747-400, for P3D and Douglas DC-6, Boeing 737-600, 700, 800 & 900 and Boeing 777 300ER for MSFS. 
Project Airbus Project AirbusSince 2001 Project Airbus made freeware add-on aircraft for the FS9 and FSX. Airbus A380 for FS9 released. Also A321. Details in their Forum.
Quality Wings Quality WingsAn experienced team producing the Ultimate Collection of payware aircraft with exceptional detail, avionics, sounds & flight characteristics. Ultimate B757 and popular BAe146/Avro RJ and B787 Dreamliner for FSX and P3D5.
RealAir Simulations RealAir SimulationsProducers of highly rated and highly detailed aircraft models. Ceased trading in December 2016 and no longer market or sell their aircraft models. Newly updated installers are available for existing customers.  (See Vertx below)
Red Wing Producers of MSFS scenery, airports and aircraft. Includes detailed models of Lockheed L1049 Super-Constellation, Farman F60, and Bugatti EB-100P. Available in MSFS via in-sim Market Place. They also produce airport scenery.
Shrike
Simulations
Shrike Simulations is an offshoot of Blackbird Simulations, with the unique goal of offering opposites – accuracy, ease of use, quality and affordability. Our aircraft are meant to bring the joy of virtual flight to all users! 530F helicopter and PA30 Twinkie
SimWorks Studios (SWS) Kodiak 100 Series II, Kodiak 100 Series III Amphibian, Van's RV-10 &14 and Zenith CH701 STOL for MSFS Also Okavango delta for MSFS and Midway Battlegroup aircraft carrier fleet for FSX and P3D.
TFDi Design 717 TFDi DesignThe modern version of a classic favourite, the TFDi Design 717 is a Boeing Officially Licensed Product. The FMS features full weight and balance calculations; flight dynamics are finely tuned. Includes wing flex and custom animations. For FSX and P3D.
Virtualcol VirtualcolGood value, low-cost aircraft for MSFS, FSX and P3D. Fokker 50, Jetstream S31, Dornier 328, ATR 42 and SAAB 2000. Models have virtual cockpits (some also have a 2D panel) and many international liveries. MSFS PC and Xbox Embraer models released and an entry-level A220 for MSFS.
Vertx VertxSean Moloney's Diamond DA62 for P3Dv4. Sean was a founder member of the now-closed RealAir Simulations. The DA62 oozes quality and detail with a large G1000 glass display, advanced aerodynamincs and great sounds.