In the United States, Federal Communications Commission (FCC) regulations limit the number of network-owned stations as a percentage of total national market reach. As such, networks tend to have O&Os only in the largest media markets (such as New York City and Los Angeles), and rely on affiliates to carry their programming in other markets. However, even the largest markets may have network affiliates in lieu of O&Os. For instance, Tribune Broadcasting's WPIX serves as the New York City affiliate of The CW, which does not have an O&O in that market. On the other hand, several other television stations in the same market – WABC-TV (ABC), WCBS-TV (CBS), WNBC (NBC), WNJU (Telemundo), WNYW (Fox), WWOR-TV (MyNetworkTV), WPXN-TV (Ion Television), WXTV-DT (Univision) and WFUT-DT (UniMás) – are O&Os.
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31, 1969, organizations requesting rulings or determinations that they are affiliates of a governmental unit must discuss in the request the presence or absence of each of the factors listed (in situations in which no ruling or determination has been received and facts and circumstances relevant to the determination (regarding the otherwise necessary administration of the law).