Only in 1950, when NBC was dominant in television and black and white transmission was widespread, did CBS begin to buy or build their own stations (outside of New York City) in Los Angeles, Chicago, and other major cities. Up to that point, CBS programming was seen on such stations as KTTV in Los Angeles, in which CBS – as a bit of insurance and to guarantee program clearance in that market – quickly purchased a 50% interest, partnering with the Los Angeles Times. CBS then sold its interest in KTTV (now the West Coast flagship station of the Fox network) and purchased outright Los Angeles pioneer station KTSL in 1950, renaming it KNXT (after CBS's existing Los Angeles radio property KNX), later to become KCBS-TV.