In the "planes and combat charts" section, there are a bunch of cool-looking designs for each particular airplane. However, once you pick a scenario, you seem to only be limited to the plane designs/colors that have been pre-selected for that particular scenario. For example, if you wanted to fly the infamous "black" Camel, you would only find it in (I think) the Camel vs Camel scenario. My suggestion would be that whichever scenario was chosen, you would have a choice of any of the available plane colors you wanted.

In an ideal world, you would be able to customize your own plane color and re-use it (or add it to the list for others to use).

If there is a way to customize an airplane and then upload the image, please let me know!