Custom tail number Aerosoft CRJ?

How do you set a custom registration number for t he Aerosoft CRJ? The airplane does not use the one I set in the ATC Options on the world map, it shows something else on the tail and cockpit plate, like N508AE with the American Eagle livery.

That function has to be built into the model files for the interior and exterior. Beyond that, you’d have to open up the livery in Gimp (or whatever you have) and repaint the reg by hand. You’d also need a separate panel folder for each one if you need different colors, since that’s controlled by the panel config file.