On June 17 in 1941, WNBT-TV, channel 4 in New York City, was granted the first construction permit to operate a commercial TV station in the United States. WNBT signed on the air on July 1, 1941.
It was owned by Radio Corporation of America (RCA) and later changed its call letters to WRCA. As RCA developed the NBC Television Network and, especially, TV in ‘living’ color in the early 1950s, WRCA, as well as its TV counterpart in Los Angeles, KRCA-TV 4 (channel 4), changed call letters once again. The station became WNBC-TV. On the west coast, KRCA was changed to KNBC-TV.
Both stations remain the flagships of NBC television and are wholly-owned subsidiaries of the television network.