Numerous other stations using "Kiss" as (part of) a service mark were acquired over the course of Clear Channel's growth, among them WXKS-FM in Boston and WKSS in Hartford, Connecticut; however, other stations calling themselves "Kiss" which predated the "KISS FM" trademark were not acquired, such as Beasley Broadcast Group's WNKS in Charlotte. Furthermore, not all Clear Channel "Kiss" stations use the national brand; WXKS-FM has never used "KISS FM", maintaining its "Kiss 108" identity from 1979. At least one station that used a non-Clear Channel-related "Kiss" branding, WWKS in Pittsburgh, would eventually be acquired by Clear Channel itself, although that station (now WXDX-FM) would flip to a modern rock format long before being acquired by Clear Channel.