Channel 9 has been around for a long time at UA
...70's for sure. I'm not sure the culture at other carriers ALPA groups would allow it....you know if you apply to fly for UA
you have channel 9 (at the Captains Discretion). In regards to 'not a selling point'.....more than a few are dialed in during flight...have heard verbal reactions thru the cabin on many flights to something humerous on 9...such as the new DL
pilot giving the welcome aboard speech on what he thought was the PA on his aircraft...instead it went out to everyone above 30,000 feet above Kansas that day...