main impetus for the trade was NBC's desire to acquire an owned-and-operated television station in the fourth-largest American television market. NBC had to receive a waiver for the swap because KYW and NBC Radio's New York City flagship, WRCA (now WFAN) were both clear channel stations. At the time, the FCC normally did not allow common ownership of clear channel stations with overlapping nighttime coverage. After clearing the final regulatory hurdles, the swap went into effect on January 22, 1956. On February 13, NBC changed KYW's call letters in Philadelphia to WRCV (for the RCA-Victor record label). At the same time, Westinghouse changed the call letters of its new Cleveland station from WTAM to KYW. The Westinghouse-NBC station swap, and its subsequent reversal nine years later, resulted in two alternate ways to recount KYW's history. In the records of the FCC, the station in Philadelphia on 1060 kHz merely underwent two call letter and ownership changes, taking place in 1956 and 1965. However most KYW histories follow the path of the call letters, and refer to KYW moving from Philadelphia to Cleveland in 1956, then returning to Philadelphia nine years later. Based on its responsibilities as an NBC-owned outlet, WRCV carried all of NBC's network programming, such as the weekend Monitor magazine-style program. Philadelphia radio personality Hy Lit briefly worked at WRCV during the first year of NBC ownership, hosting a local rock-and-roll program and an adult standards show for the NBC network. WRCV adopted a big band format featuring swing music popular during the pre-rock era. Return to Philadelphia (1965) Almost immediately after the NBC-Westinghouse trade was finalized, Westinghouse complained to the FCC and the United States Department of Justice that it had been coerced into making the station swap, including a threat by NBC to revoke Westinghouse's NBC-TV affiliations. A lengthy investigation was launched. In September 1959 the Justice Department issued a decision which, in part, instructed NBC to divest WRCV-AM-TV by the end of 1962. Several months later in early 1960, NBC announced it would trade its Philadelphia stations to RKO General in exchange for that company's Boston outlets, WNAC-AM-FM-TV. That proposed station swap was held up for nearly four years until the FCC issued a final decision in August 1964. The Commission renewed NBC's licenses for WRCV radio and television, on the condition that the 1956 station swap with Westinghouse be reversed. RKO General initially contested