I did not know they have a Classic Hits feed. What iHeart does with most formats is provide access to a big library, and each station pulls the songs from the server that are selected via research for that market. From then on, the workparts are assembled locally or, at least, regionally from a hub.I believe WODC is programmed locally now since they transitioned to classic hits last year, or they pull from iHeart’s Big Classic Hits feed.
Smaller markets share research with bigger ones that have similar characteristics (Dayton is like Columbus but not like Macon...). The playlists are assembled locally and integrated with the commercial logs for each station. Talent can be shared via integration of bits with the local log; that is how Seacrest can be on both AC and CHR stations and even in different dayparts.