Hi, thanks Alan - "reboot" was my part of my first few independent efforts to rectify. When I noticed it was down, I did "apt update", "apt upgrade", and the same with "apt-get", changing the upgrade to "full-upgrade". It initially took something like 15 upgrades, which isn't too unusual from what I've observed - rebooted, and still no-go.
To verify whether it was my setup, or my process, I checked the flight aware feeder running on the same pi and it was functioning normally, reading aircraft near and far.