I think Xtra106.3 is a Fox News affiliate, at least they were at one time.WSB Radio replaced ABC with CBS many years ago. WYAY was ABC's Atlanta affiliate from 2010 to about 2013, I don't think any Atlanta station has the ABC affiliation today. I don't think any Atlanta station is carrying Fox right now, either. So I guess either of those are a possibility if WSB wants to keep a network affiliation (does AP Audio still do newscasts?)
While WSB only uses bits of CBS sound inserted into its local newscasts during the day and evening, it plays the CBS hourlies overnight, so presumably it has three choices: pick up one of the other networks, hire more staff for overnight newscasts, or give up on live overnight news.
Also, Mark Arum regularly has ABC reporters on his program. In the past week, he has had at least 3. Would that indicate that they are still an affiliate?