I do this type of work professionally (branding, livery design etc) for actual airlines. I’m also active within the FS community and have done hundreds of liveries for three dozen plus airlines. No airline has ever initiated legal action against anyone in the FS community or elsewhere for reproducing their brand, ever. It’s free marketing and brand recognition. Furthermore, as an example, I worked directly with American Airlines to recreate their livery for the Aerosoft Airbus series.
Count me in!
You can find examples of my work at my site and in the Aerosoft downloads section.