Fallen Flag Photos

Kinda multiple questions/suggestions in one here - I just posted a photo of a plane from a “Fallen Flag” airline - Cat Island Air (Tail number C6-CAP an Embraer 110) I was trying to find the airline code for that, but failed, and so had to leave the field blank.

Is there a good substitute to put in, in this case? It might be interesting to have a searches which would specifically return “fallen flags.” Also - is there a way to add or suggest Airlines to add, in a case like this, if FA doesn’t seem to know about a particular airline? Is there a way to add a tag for this airline?