China Bans Flightradar24
Speaking for the USA, the ADS-B data stream you see on FlightAware's commercial feeds has military and police aircraft data filtered, even if those aircraft are broadcasting that information. While ADS-B data reception is public, certain data types must be removed in your commercial offering per FAA.Near me in Puget Sound / Seattle are two intl airports, several military bases including a nuclear sub base, plus we're near the US / Canadian border. Air traffic as you can imagine is very interesting and includes state police Cessna's at night cruising for people speeding on Highway 18, military transport through JBLM (military base) but no fighter jet ADS-B. There's commercial air traffic, hobby planes, private jets, hospital and news helicopters. There's flight paths and local flight patterns. My current mystery are the small, black, unmarked DHS (I think!) helicopters that cruise Discovery Park lighthouse every few hours. They don't show up on ADS-B at all. There's more but you get the idea of how cool this all is. SDR is just wild. All you need is a Pi 3 and the PiAware image, the antenna and the 1050 filter they suggest. PiAware has a local webinterface that shows everything it's picking up but will be filtered later by FlightAware.