The simplest way is to use @wiedehopf’s script
Native support is very new, only a month or two old.
FlightAware Integration
The easiest way to integrate Airspy into an existing FlightAware PiAware is described here.
If you don’t need all the details, you can just use this neat installation script by FlightAware member @wiedehopf . This script works for FlightAware SD Card images:
sudo bash -c "$(wget -O - https://raw.githubusercontent.com/wiedehopf/airspy-conf/master/install.sh)"