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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
 Scenery and Airport Producers G-P
 Gaffer Simulations Airport scenery for South Africa. Inlcudes Lanseria International Airport, O. R. Tambo International Airport and King Shaka International, Durban. Also freeware SA aircrfat livery and Johannesburg MSFS scenery
Godzone Virtual Flight Offers nice photoreal scenery of three areas of New Zealand with airports and other features and lots to explore. Scenery shop, screenshots, downloads and fixes.
Greek Airports Project Large collection of Greek airports scenery. Also Greek lakes and seaports scenery. In Greek and English. Check out latest news on Facebook.
iBlue Yonder Bill Womack's sceneries now marketed directly under his own iBlue Yonder name. Includes Tongass Fjords X, Hawaii Dillingham X, Stark’s Twin Oaks Airpark and others. Some require Orbx scenery.
Imagine Sim Features a collection of payware FSX & P3D airports including Kansas City, Cincinnati, NY La Guardia, Shanghai, Singapore and others. Aim is to bring the very best in flight sim scenery. KATL Atlanta for MSFS.
Italy
Photroreal
Dedicated to photorealistic sceneries for FSX and P3D, especially of Italy and other European countries. offers tutorials on making your own custom photoreal scenery. MSFS versions are relased via https://flightsim.to 
JetStream Designs Producers of airport sceney for FSX, PD3 & MSFS featuring high details, animated scenery objects such as jetways and airport vehicles. Includes Paris Orly, Nantes, Milan Linate, Palermo, Little Rock and others. Facebook...
JustSim Producers of good qualiity and highly detailed airport sceneray. Products include Innsbruck, Barcelona, Varna, Nice and others. Products are on SimMarket...
Latin VFR Finely detailed and crafted scenery for important airports in South America and The Caribbean. Includes Santiago, Kingston’s Norman Manley, Sao Paulo’s Guarulhos International and several more.
LHSimulations Our goal is to recruit Hungarian add-on designers to work together on Hungarian sceneries and aircraft. Excellent, highly detailed, payware and freeware Hungarian airport and scenery. Budapest LHBP released.
LLH Créations Highly detailed French alpine airport scenery for FS2004, FSX and P3D, featuring winter and summer textures, sloping runways. Includes Méribel (LFKX), Grenoble le Versoud (LFLG), Courchevel (LFLJ) and several more.
Malta Scenery Design Information, updates and support page for payware Malta International Airport for FS9 and FSX. Forum. Also a freeware coastline and landclass and local charts.
Mazzokan Pfotorealistico dell'Italia Photo realistic scenery of Italy for FS2004 (FS9) and FSX. Covers various regions and islands, including Calabria, Lazio, Rome, Toscana, Umbria, Sicily and others. Last updated 2010.
MegaScenery Earth US photo-scenery using high-resolution aerial photos giving you a view from your aircraft just as it looks in the real world. Pay for and download just the areas of the USA you need.  Includes NightScene tecnology.
Misty Moorings (Return to) Two web sites dedicated to the scenery add-ons available for the Pacific Fjords region of North America. Includes Tongass Fjords and Misty Moorings. Misty Moorings is for FS9. Return to Misty Moorings for FSX.
MK Studios Founded in 2008, we offer highly-detailed airport visualizations including their surroundings with satellite imagery, infrastructure, special effects, and night lighting. Dublin, Lanzarote, Lisbon, Tenerife & Vagar. Orbx partner.
M'M
Simulations
Producing detailed scenery of European and Turkish airports including Izmir Adnan Menderes International, Dalaman International, Castellón Airport in Spain, St. Gallen–Altenrhein in Switzerland, Stockholm Skavsta Airport and others.
Netherlands 2000 A fantastic freeware scenery that depicts all of The Netherlands, including the entire road and rail infrastructure, all major airports and many smaller ones, detailed coastline and much more.
Offshore Development Group The contact point for offshore-scenery developers & end-users, providing centralised resources, and a focus for development. Requires forum registration. Not sure if still active. Also see FSX-Shipyards.com
Orbx Simulation Systems Hand-crafted, world-wide autogen, water, roads and trees scenery and detailed scenery for many regions of Australia, NZ, USA, Canada & UK. Also high quality airports. Support Forums (require registration).
Pacific Islands Simulation Well detailed and very nicely done sceneries for FSX of small island countries and "trust" territories of the Pacific Islands region. Payware. Plus some P3D 64-bit airports.
PhotoSim Labs Detailed scenery of the Commonwealth of The Bahamas. Two areas - The Berry Islands (30 sq. miles (78 km2), thirty islands, 3 airports), and South Bimini & Cat Cay (2 airports, seaplane base and helipads).  Facebook...
Pilot's Developers of FS Global Vector scenery, FS Global Real Weather and FS Global Ultimate worldwide high definition mesh. KCDK - Cedar Key Airport for MSFS
PTSim Home of SbuilderX, a scenery creation tool by Luis Sá. It can produce land and water class, photo and vector scenery and various placements and effects. Also Portugal Terrain and Madeira Islands scenery.
Pilot Experience Sim Airport sceney for French airports Saint Tropez and Montpellier Mediteranne for P3D. Also Tomato and PTA presets and P3D Settings Pack, a manual about getting maximum and stable performance from P3D. Facebook...
   pilotplus Developing UK airports for MSFS, P3D and X-Plane including Oxford, Southend,  Wycombe Air Park, Bristol International and Biggin Hill. Facebook...
PrealSoft PrealSoft Scenery Design sell a range of high definitation city scenery for FSX and P3D. Brussels, Dublin, Casablanca (city and airport),  Madrid, Barcelona and others. Also new textutres for grass, water and trees.
 Pyreegue Dev Co. Nestled between coastal mountains Tivat Airport on the Adriatic coast of Montenegro poses a unique challenge to pilots up on the approach to runway 14. A good places to practice your piloting skills in MSFS.