Automated Dependent Surveillance Broadcast -- The most common way of tracking aircraft with simple radio receivers. This community is for discussion of the hardware and software needed to track the planes around you, how to feed that data to the aggregators, and many other topics around that.
Running an RTL SDR v3 with a homebrew antenna, pulling data into readsb that gets piped into other services like tar1090 for the front-end map display, and Skystats for all kinds of extra data like "Interesting aircraft" and various route data, including the most popular routes, origin airports, and airlines.
I just got my pi feeder up and running a month or so ago. I had no idea about skystats, I'm going to spin it up now and take a look!
edit: for those that might come across this, setup was super smooth, I'm running on another VM that is just grabbing data from my readsb instance on my raspi.