AT 40 was first on in Boston on WMEX 1510. WMEX was one of the original 5 stations that first broadcasted him on July 4th 1970. It remained on WMEX until the Spring of 1975. It was off the Boston airwaves for about 2 years. WCGY picked it up around I think late Spring/early Summer 1977. While it was on WCGY, WROR 98.5 picked it up around 1980. They ran it till about 1985 when it probably was taken off ROR by the ABC networks when they forced AT 40 outlets to also pick up inventory from the ABC Radio Networks. When they resisted, ABC moved them to another outlet. That's how it ended up on WBZ since they were an ABC Radio affiliate station. WCGY dropped it around Spring 1987. WBZ ran it for a few years and it was picked up by WZOU around 1987. WZOU picked up Casey's Top 40 around Spring 1989 moving AT 40 with Shadoe Stevens to Saturdays 6 AM and CT 40 to Sundays 8 AM. Both were dropped when ZOU changed to WJMN. WVBF 105.7 did pick up Casey's Top 40 for a short time after Jamn 94.5 dropped it. After that Mix 98.5 picked up Casey's Top 20 (Hot AC) for a few years. After that I think he changed networks to CC's AM/FM Radio Networks and he regained the rights to AT 40.