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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
Scenery and Airport Producers Q-Z
Pilot Experience Sim Airport sceney for French airports Saint Tropez and Montpellier Mediteranne for P3D. Also have Tomato and PTA presets. Also P3D Settings Pack, an intermanual about getting maximum and stable performance from P3D. 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.
Toposim Toposim sell area, country and continent bundles of their UltraMesh terrain mesh, compiled to high LODs, offering great detail and accuracy. Specially designed to appeal to low and slow barnstormers, bush  & ultralight pilots.
REX Worldwide Airports HD Photoreal global airport structures and environment, created from real-world counterparts. It will customize and transform over 24,000 airports within the sim and includes ground vehicles For FSX and Prepar3D.
SamScene 3D Detailed scenery of famous cities around the world for FSX and P3D. Includes Osaka, Singapore, Rome, Amsterdam, Milan and others.  Facebook page...
Scenery Solutions Producers of Ultimate Terrain and CityScene scenery balancing detail, performance and value. Large cityscapes and detailed airport areas in USA, Canada, Italy, Spain, France. Some via Orbx. Facebook.
SceneryTech Our landclass products for FSX fix nearly every issue found in the default scenery, from pervasive desertification of the landscape to missing towns and cities. It will ramp up the realism.
Scotflight Scenery High quality add-on scenery for Scotland. Detailed scenery for most of the airports in Scotland, plus many landmarks bridges, transmitter masts and lighthouses. For FSX and P3D, works with Orbx Scotland.
Sim720 Well crafted airports in Wales, Scotland and the USA. Includes Caernarfon (EGCK), Inverness (EGPE), Stornoway (EGPO), Santa Barbara (KSBA) & Catalina (KAVX), and Germany's East Frisian Islands airports. FSX and P3D.
SimAddons Payware airport scenery for many international, regional and small Canadian airports. Single airports and area packs available. Most scenery includes custom animations and lights.
Sim Design Group (SDG) Scenery of Egypt & Middle East for FSX & P3D. Includes Cairo, Luxor and Sharm El Sheikh - Ophira Airport. Also produce useful scenery backup and reinstall tool - FSCubed that stores a snapshot of your installed scenary.
Sim-Wings Producers of high quality, highly detailed payware sceneries of parts of Spain including the islands of Ibiza and Mallorca and airports. Products are at Aerosoft and SimMarket. Facebook
stuff4fs A collection of freeware airports, aircraft re-paints, and scenery utilities for FS9 & FSX. Five Vancouver Island and Lower Mainland British Columbia (Canada) airports have been completed. Also home of AI Flight Planner.
Sun Sky Jet KPHL Philadelphia International Airport for FS9 & FSX in superb detail with many extras. Includes seasonal ground changes. Incredible freeware (donations accepted). KDTW (Detroit Metro) for P3D in Beta. Facebook...
SXAD SX Airport Design airport scenery for FSX and P3D. Airports include the UK's Exeter International and Lydd, and the USA's Norfolk International, Pensacola International and KBHM Birmingham-Shuttlesworth.
Taburet (@ SimMarket) Producers of scenery for FSX, P3D and X-Plane. Products include replacement vector and photorealistic scenery for cities, countries and whole continents, and 'Night 3D' night lighting. Products are at Sim Market.
Team SDB Team SDB, consisting of Michael Dewes and Frank Safranek, have produced scenery of over a dozen mostly UK RAF and USAF bases. They have also produced SDB CVN-65 USS Enterprise ‘Final Cruises’ for advanced carrier operations. YouTube Video...
TerraBuilder TerraBuilder can convert large-size, high altitude or satellite images into photorealistic FS2004 and CFS scenery. Also TerraBuilder Moon - Over 300,000sq. km of lunar landscape to explore, and FSX SpacePort add-on.
The Old Hangar forum and information about the earlier 'golden age' of flying. GW scenery downloads will regress fs2004 to the period from 1920 to 1940. Plus golden age aircraft and ground vehicles. Kindly hosted by SOH. Forum
TileProxy A brief "Getting Started" guide to TileProxy Beta, a freeware interface between FSX or FS9 and the WWW. It downloads photo-terrain textures from online map services to turn FS into an inter3D map browser.
Turbulent Designs Design team of highly experienced airport designers. Detailed airports with custom models, HD textures blended with high resolution terrain mesh and photo real coverage. Fully compatible with P3D and FSX. Published by Orbx
UK2000 Scenery Highly detailed commercial scenery of UK airports by Gary Summons. Includes Gatwick, Stanstead, Edinburgh, Bristol and others for FS2004 and FSX. Also UK2000 VFR Airfields. Buy singles or in groups. Forum.
Vector Sceneries Detailed scenery add-ons for Orbx FTX regional scenery by Richard Bui. Click on FSX/P3D. Includes Dover, and Eastbourne, UK; Lady Musgrave Island on the Great Barrier Reef; Scottish Castles and more. For FSX & P3D
Vidan
Design
Highly detailed Danish scenery for FSX and P3D. Airports, smaller airfields and photoreal scenery.  Large airports include Aalborg, Billund, Bornholm and Sonderborg.