That's interesting. I've yet to ride in a 321 so haven't seen it in person. I have ridden in a number of 319 and 320 aircraft with Ch.9.

The 321 does have some differences in it's radios and pilot audio panels so perhaps they are needing to do a customization such as the one they have/are done/doing to the 737s. I'm sure it will show up at some point.