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After getting the script used to create the mesh, I found that the normals of some faces are not pointing outwards, so we don't see those faces correctly. You can check the normal direction by clicking the right square at the bottom of this menu and change the size as needed.

For the plane's body, I see this

You may want to change the python script to generate this properly, or you can just change the normals of the generated model. Or if you want the mesh to be rendered double-faced (seeing the face from both sides), you can add

  cull_hardware none
  cull_software none

inside your material's pass in the material script.