A clue on the Jeopardy! that just aired was the NBC Blue network now being the NYPD Blue network ABC. Even on the most ancient of TV listings shown on TV Tango, there is no NBC Blue shown, just ABC.

A clue on the Jeopardy! that just aired was the NBC Blue network now being the NYPD Blue network ABC. Even on the most ancient of TV listings shown on TV Tango, there is no NBC Blue shown, just ABC.
The NBC Blue radio network was sold & became the Blue Network in 1943 & finally ABC in 1945.
https://dp.la/exhibitions/radio-golden-age/radio-broadcast-news/radio-broadcast-nbc

Thanks for the link, I was unaware that antitrust was behind all of that.