Yesterday I have tested to use a new RasPi 4 with 4 GB RAM together with FlightAware 3.7.1.
and the FlightAware SDR PRO with integrated Filter.
Success ! It works fine !
Instead of a PiAware 3 Image on SD I have generated a new RaspBian Image with integrated Pi 4 Drivers. At next I installed a FlightAware 3.7.1 as descripted in FlighAware documentation.
The only “ugly” thing must be noted speciallly :
The Pi 4 without a cooling fan still very hot. It seems to be not really a long term stable platform.
Therefore a good and effective cooling system is essential.
Power ? More than some classes better than Pi 3.