Microsoft Flight Simulator allowed users to create their own aircraft. The latest version of the simulator was Flight Simulator X (FSX). People generally created aircraft for FSX using either FSSC or GMax. These were saved as FSC files. I personally used FSSC to create aircraft, ships and scenery and GMax to create landable surfaces. These days, FSSC is no longer available and Blender is the most popular program for creating models.

Converting my old FSSC models to Blender models was a challenge because there is no program to convert FSSC models to Blender. The best option appears to be to use a program called "ModelConverterX" which can load FSC models and save them as obj files. These obj files can be imported into Blender.

ModelConverterX can save the FSC models in other formats. However, the obj format seemed best at preserving textures. The disadvantage is that obj does not preserve separate parts. Thus, the object file that you import into Blender will be a single mesh with many textures.

Separating this mesh into separate parts is a time consuming process. If the fsc model that you import is not yours, it will feel like it is yours at the end.

Once you import the model to Blender, you can use the capabilities of Blender to create a more realistic looking model than the original. Although documentation is scarce, you should also be able to export Blender models to Flight Simulator 2020.