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There's no mandate for phasing out AM broadcasting on the HF bands, especially not in the US (where the use of digital radio broadcasting by any station is still completely optional at the discretion of the station and where there is no mandate to decrease or remove analog radio broadcast services).

Thank you. That significantly changes my understanding of the story.

There are currently no signs that Longwave and Shortwave AM broadcasts are going away here in the UK. If Droitwich Transmitting Station[0] can stay operational for another 14 years it will be 100 years old!

[0]https://en.wikipedia.org/wiki/Droitwich_Transmitting_Station

To my knowledge, digital radio mondiale is only used on shortwave bands, and not on conventional ("broadcast") AM radio stations in the United States.

I haven't kept up on the SW scene in a decade or so, so I may be mistaken.