On Thursday, September 3, 2020 at 6:50:01 PM UTC-5, wrote:
ALL aircraft radios and ground communication equipment would have to be changed SIMULTANEOUSLY worldwide.

Perhaps there was a lost opportunity to make the new channels in the 8.3khz radios FM?

I've heard old stories that the reason aside from history was that in the event of a double, with AM you hear both. But with FM the stronger signal may capture the receiver and you would not know that the second guy was there.

HAM's definitely are better at communicationg than the aircraft folks.