Some ATC Call signs Info missing

The topic of callsigns and aircraft names etc can be a complicated one.

There were a few separate discussions on the topic back in the Traffic X forums. I've provided a few links to those below.

Reading your post, you mention the "airlines.cfg" file, so it sounds like you already have a bit of a handle on how it works. Therefore, you may already know most of the stuff that those posts in Traffic X are talking about. Still, if you read through them, you might find something new that you didn't know and maybe the answer you seek could in fact be hidden somewhere in those threads.

Yes, noted that the posts are related to Traffic X (and not Traffic 360). But, Traffic 360 and Traffic X are essentially the same package, just with different front screens and user interfaces. And, besides, callsigns and aircraft names etc are handled by FSX via files like the "airlines.cfg" file ... so those posts and threads are all still relevant anyway.

In short, I don't have a specific answer to your question. But, hopefully, the posts linked to below will provide some food for thought, or perhaps even the answer you seek hidden away in there somewhere.

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Post link 1 ... Callsigns Incorrect?

Post link 2 ... AI Callsigns

Post link 3 ... How to add new planes to Traffic X for Flight Plans

Post link 4 ... Airline Call Signs

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There may be others. Do an ADVANCED search in the Traffic X forum for terms like "callsign", "call sign" (note the space), "aircraft name", "tail number", "airline code", "ATC_airline" (a term from the airline.cfg file, so note the underscore character), "ATC", etc. And remember to tell the search to use ANY DATE as the posts in the Traffic X forum will all be from a while back now.