As it is right now, planes are drawn as simple black dots when they are within con range but not close enough to actually require the model to be drawn.
Would it be possible to (pre)calculate two colors, one being an average of all the colors used in the upper half paint scheme (what you see from above a plane) and the other being the average of the lower half paint scheme (what you see from below a plane).
These colors could then be used instead of the black dot color depending on whether the con is above or below the spotter. These two colors should also be adjusted according to the present lighting conditions.
IMO this would add some meaning to camouflage paints on all planes and vehicles. On the other hand, it'll make spotting planes a tad more difficult which, depending on the arena, might not be to everyone's taste.
-Amboss