I didn't test this yet but I'm pretty sure that it is nonsense to believe, the resolution would get worse, just because it is RAW. The main purpose of using the RAW format in photography is being able to change white balance, color dynamic and other characteristics of the picture after making it. The resolution doesn't change, compared to JPEG.
If you really wanted to alter the white balance, make sure that you do it equally with all pictures. I see no reason to use RAW, as the aesthetic requirements are very limited in aerial photography.