I just set up an rpi and started tracking yesterday (LGAT-136481). I need to experiment with antennas and antenna placements, so I’ve been watching my local feed closely and comparing it to the FA and FR24 public sites, so that I can see the aircraft that my feed doesn’t see and draw conclusions about the antenna. That’s how I noticed something weird: my feed sees a lot of traffic that never shows up on the FA website.
First thing, I checked the feed. Sure, I see the traffic, but am I actually forwarding it to FA? The answer was categorically yes. Next question, is it “odd” traffic, e.g. military, unknown identity etc? Yes, sometimes, but most of the time it’s airliners on scheduled flights, I have consistent and regular messages from them (i.e. mesg=(hundreds) and age=0), I can see them on FR24, but they still don’t show up on FA.
So to the question: How come? Are any feed data intentionally filtered, or how else can flights not show up on FA, although a feeder has seen them and fed them to FA?