Yeah, they have made exceptions to the rule. I have two Sopwith Camels and the Fokker Dr.I.
They also have a few fighter-like aircraft in colorful schemes.
Here is another of my own designs. The Casablanca-class escort carrier USS White Plains. I built this last winter but finally came around to order the last missing pieces in the correct colors. The black stripe at the waterline is the best I could do. Cobi would obviously get the line straight by printing parts in two colors
USS White Plains participated in the Battle of Leyte Gulf, where she was first engaged by Japanese surface units of the Center Force and later by Kamikazes. The battleships Yamato and Nagato engaged her with their main guns and White Plains suffered damage from a near miss, but continued to be operational. White Plains in return scored multiple hits with her sole 5-in gun on the Japanese heavy cruiser Chōkai.
I’m not going to have much time during my days off between trips. I will probably need to bring this with me on the road. You think it will look odd going through airport security and strolling up the gate in front of passengers with this box?