operations, left Belo with the sole recourse of acquiring a television station that was already on the air if it wanted to own one in the Dallas–Fort Worth area. In January 1950, Belo purchased KBTV from Lacy-Potter for $575,000; the sale received FCC approval on March 13, 1950, with Belo formally assuming control of Channel 8 on March 17. The station was the first television property to be owned by the Dallas-based company, and also served as the flagship station of its broadcasting division until Belo merged with the Gannett Company in 2013. Four days later on March 21, Belo changed the station's call letters to WFAA-TV to match those of its new radio partner WFAA (570 AM, now KLIF). The WFAA calls reportedly stood for "Working For All Alike," although the radio station later billed itself as the "World's Finest Air Attraction" (the KBTV call letters were later used from 1953 to 1984 by what is now sister station KUSA in Denver, and since 1999 are used by a Beaumont station). WFAA is one of a relatively limited number of broadcast television stations located west of the Mississippi River whose call letters begin with a "W"; the FCC normally assigns call signs prefixed with a "K" to television and radio stations with cities of license located west of the river and broadcast call signs prefixed with a "W" to stations located east of the river. The anomaly in the case of the WFAA television and radio stations is due to the fact the policy predates the launch of the former, as Dallas was originally located east of the original "K"/"W" border distinction defined by the FCC. In 1950, WFAA switched its primary affiliation to NBC, and also affiliated with ABC on a secondary basis. DuMont shut down in 1955, amid various issues that arose from its relations with Paramount that hamstrung it from expansion. Although it had been apparent from the start that Dallas and Fort Worth (which Arbitron originally designated as separate media markets) were going to be collapsed into a single television market due to their close proximity, Fort Worth Star-Telegram owner Amon G. Carter—who founded WBAP-TV through his company, Carter Publications—did not care whether residents in Dallas could view that station; WFAA affiliated with NBC under a time share arrangement with WBAP-TV to expand coverage of the network's programming to areas of central and eastern Dallas