WWCK

Flint, Michigan's WWCK went on the air as a daytime Top-40/nighttime Rock station in 1971.  The call letters were chosen to take advantage of (and/or a tribute to) Windsor, Ontario's legendary CKLW.  By the mid-1970s they had gone full-time AOR and by the early 80s became the highest rated Rock station in the country and won a Billboard award for "Best Local Programming-All Markets".  Documentary filmmaker Michael Moore once had a Sunday morning talk show on WWCK called Radio Free Flint.  As of this writing, WWCK carries a CHR format as "CK105.5".

Check out this excellent documentary about the history of "Flint's Best Rock".