FlightAware tracking data

Hi

Where does FlightAware get it’s tracking data?
Do you use any amateur ADS-B, Acars or HFDL feeds?

After a move of houses 2 years ago I am slowly getting my gear back up
and running. HFDL and Acars will be first back up.

Ken

Mostly feeds from ANSPs (flightplans, positions) and air carriers (gates, gate times, positions).