on april 19, 1965, wins dropped music and instituted a 24-hour, all-news format. kyw went all-news six months later on september 12, three months after westinghouse regained control of the station (see "the 1956 trade with nbc", below). kfwb would adopt the format on march 11, 1968. the three stations all prospered with their new formats, usually ranking among the five highest-rated stations in their markets. during the 1970s and 1980s, wind also tinkered with a part-time news format, though it had little success against the dominant all-news station in chicago, cbs-owned wbbm.