A friend from one of the radio stations told me once that was a rent-a-chopper with Sunny 95 as the primary and the cost shared with other stations, just "branded" Yellow Thunder; that same chopper (and Bill Taylor) did traffic reports for several stations. I don't know too many radio (or TV) stations with the financial revenues to afford to own a chopper full-time. It's a pretty select crowd, and WBNS in Columbus is one of the few.
(I majored in broadcast technology and journalism in college; one of my classmates at the TCOM school worked for TV and radio stations in Columbus, which is where I got that tidbit).
They actually had a very specific schedule for which stations got their traffic reports when; Sunny 95 got it at zero (0800, 0810 etc), WTVN on the twos (0802, 0812 etc) and so on. Don't remember the exact schedule but it was fun to listen to the downlink from the chopper on the 450/455 simplex frequencies as they went down the list.