The stations carrying The WB Television Network were another exception. The controlling shares in the network were held by Time Warner, with minority interests from the Tribune Company and, for a portion of network's existence, the now-defunct ACME Communications. While Tribune-owned stations such as WGN-TV in Chicago, WPIX in New York City and KTLA in Los Angeles (along with most of the ACME stations) aired programming from The WB, they did not fit the standard definition of an owned-and-operated station. A similar exception existed when UPN launched in January 1995 by co-owners Chris-Craft and Viacom. Each of the companies owned a number of stations that aired the network. However, the stations were also not considered O&Os under the initial standard definition. This ambiguity ended with Viacom's buyout of Chris-Craft's share of the network in 2000, which came not long after its merger with the previous CBS Corporation. The stations were referred to informally as UPN "O&Os" (Chris-Craft later sold its stations to Fox Television Stations, the subsidiary of the then News Corporation that primarily operates Fox's O&Os, in 2000).