BY-NC-ND 4.0 says that you are not allowed to use anything related to the plugin (no matter if it's an art asset, config file or whatever else) in any commercial way. That's it.
But honestly what are you trying to achieve here? If you we're asking for a free license you should've given me your name and the airport we're talking about and you would have had received the confirmation to use it for free already.
I hope you understand that with such an argumentation, however, we are not too interested in working together. Therefore, I will end this conversation at this point.