the mesh contains some errors as you already can see where the color changes gradually to black.
Some faces are flipped, and some overlap. I corrected them for your file.
You have to add textures from the library to the __airport__runway, otherwise will it not show up in aerofly.
I added some examples to your file.
Please compare center position and rotation of the file.
I don't have an image coverage, so you have to move it to the correct position.
Converter runs now without an error. You can always check the tm.log to find out, whether it is a critical error.
When doing the decals, please follow my suggestions.
You can't have all decals in a single object.
This is the new airport file: