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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
Greek Airports Project Large collection of Greek airports scenery for S9 and FSX. Also Greek lakes and seaports scenery. In Greek and English. Check out latest news on Facebook.
iBlue Yonder Offer highly detailed airports for MSFS that include custom night lighting for the highest level of immersion.  Dallas Love Field (KDAL) with downtown Dallas included, and Portland International (KPDX).
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.
iniBuilds Detailed, popular scenery by their in-house team for MSFS including, Detroit, London Heathrow, New Yourk JFK, Maasai Mara, Sothampton and many more. Manage all of your iniBuilds Store product purchases with ease all within the new iniManager Application.
JetStream Designs Producers of airport sceney for FSX, P3D & 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 for P3D and MSFS. Products include Innsbruck, Barcelona, Varna, Nice and others. Products are on SimMarket...
LatinVFR Finely detailed and crafted scenery for important airports for MSFS and P3D/FSX in South America and The Caribbean. Includes Santiago, Kingston’s Norman Manley, Sao Paulo’s Guarulhos International and several more. Also offer Airbus models for MSFS.
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 for FSX, P3D and MSFS. 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.
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. For FSx and P3D only.
Mex High Flight Numerous Mexican payware and freeware airports for FSX and P3D. Also José Martí Int. (MUHA) and Ixtapa-Zihuatanejo Int (MMZH) for MSFS,  All with carefully detailed 3d objects and buildings, realistic ground markings and many static objcets.
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 for MSFS. Includes, Dublin, Lanzarote,  Tenerife, Vagar, Kangerlussuaq (BGSF) in Greenland and Montreal (CYUL). 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 Groundbreaking in its time, this fantastic freeware scenery for FSX and P3D depicts all of The Netherlands, including the entire road and rail infrastructure, all major airports and many smaller ones, detailed coastline and much more.
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 and flight sim utilities. 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. For MSFS they offer Salt Lake City Intl, Incheon Intl, Reno-Tahoe Intl  and Cleveland Intl.
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).  For P3D. Facebook...  
Pilot's Developers of FS Global Vector scenery, FS Global Real Weather and FS Global Ultimate worldwide high definition mesh all for FSX/P3D. KCDK - Cedar Key Airport for MSFS
PTSim Home of SbuilderX, a scenery creation tool by Luis Sá for FS9 & FSX. It can produce land and water class, photo and vector scenery and various placements and effects.
Pilot Experience Sim Airport sceney for French airports Saint Tropez and Montpellier Mediteranne for P3D and MSFS. 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 (on Facebook) PrealSoft Scenery Design sell a range of high definitation city scenery for FSX, P3D and MSFS. Brussels, Dublin, Casablanca (city and airport),  Madrid, Barcelona and others. Also new textutres for grass, water and trees. Products are listed on SimMarket...
projectmax
(@simmarket)
High quality, true-to-life airports with the real life buildings and site recreated with ultra high details. Incudes CYZF Yellowknife Int Canada, WAMM Sam Ratulangi Int, WIGG Fatmawati Soekarno and WAHH Adisutjipto airports in Indonesia for MSFS.
Pyreegue Dev Co.
(@ Contrail)
Nestled between coastal mountains Tivat Airport on the Adriatic coast of Montenegro for MSFS poses a unique challenge to pilots up on the approach to runway 14. A good places to practice your piloting skills in MSFS. Also Belfast, Edinburgh, Glasgow and East Midlands airports.