*March 31, 1975 - Asahi Broadcasting Corporation (ABC) dropped out JNN and Mainichi Broadcasting System, Inc. (MBS) joined the news network due to ownership issues with ABC.
* 31 марта 1975 — "Asahi Broadcasting Corporation" (ABC) вышла из состава JNN, и "Mainichi Broadcasting System, Inc." (MBS), наоборот, вошла в состав сети.