Using archlinux, installed from the AUR repository, Flightgear 2018.3.2
Problem occurs in all planes tested, at all airports tested.
I start up flightgear, and, on the runway, go the the AI tab and look at the ATC frequencies avalible. I tune to ATIS, and nothing comes over the radio. No text, no voice, nothing.
When I tune to the tower freqency and press ' to pull up ATC interactions, there are no options in the window.
Are either of these features supposed to be in a working state?