

ADS-B is public broadcast though… if you’re in range of the plane, you can pick up its air traffic control data (elevation, speed, heading, registration, etc)… services like flight radar 24 don’t work on FAA data: they are a huge network of regular people across the globe with ADS-B receivers contributing everything they see
and worth noting that by “publicly available” here, it’s not like it’s published on some FAA API: ADS-B is broadcast from all aircraft, and anyone can receive its data… these services run by networks for regular members of the public contributing the data from their ADS-B receivers