Originally Posted by
Herb687
How long ago was this a thing?
I certainly remember channel 9 (and on certain older equipment channel 4) on UA but I never remember ATC on AA.
Good question. I would say that some parts of the list go back 20+ year, maybe 25+ years on the oldest (they were in effect 35 years ago, but I don't remember when they stopped).
Specifically regarding AA, I think I was told that they stopped it around the time of one of their major crashes.