Hi socialdragon, I will try to explain myself better.
Do you have in mind the difference between the space occupied on the screen by a 4/3 ratio aspect, one occupied by a 16/9, and another of a stretched 4/3 wich is melted in the space of a real 16/9, right?
Well in this specific case of the supermodel you have a perfect rendition of a 4/3 screen aspect, another perfect rendiotion of a stretched 4/3 if you like fat characters and objects but when you select the 16/9, in some games and specific stages you can assimilate the screen in 4 boxes: the setting for example is this: selected 16/9 from the ui or the cfg, virtua fighter 3 is the game and one of the stage with this problem is the Taka-arashi one: you have the first box that is the rectangle of the half bottom of the screen, which is perfect rendered. Then you have the top half of the screen which is divided in the other 3 boxes: the middle box, wich corresponds to the original 4/3 in the game is perfect rendered, and show the sky normally. the other 2 boxes at the right and the left of this don't show the sky but just black screen portions, because the 2d elements outside the original 4/3 it's simply not shown/rendered.
I know that an image woul have explained better what I've tried to say but I'm far away from the my pc and for now I can't take a screenshot so I hope you can understand anyway.