Check this post, simple image that allows you to feed multiple aggregators. It now has the option to point to a beast output, so you can install the image on a 2nd Pi and point it to your Piaware.
I’ve been working on this project for a while and by now I think it has matured to the point to really make it easier for beginners who want to feed ADS-B data to FlightAware and many other aggregators.
The ADS-B Feeder Image can be used on a Raspberry Pi (and quite a few other Single Board Computers) as a complete, self contained image. If you are already running DietPi on a system, it can be installed as an app using dietpi-software, and for people who have a different Linux system that’s reasonably recent, it can even be installed using a script so it runs as an app there.
I posted a short video showing how easy the initial setup is, a lot more details (including much more on the initial install process) can be found in the adsb.im howto and of course the adsb.im FAQ .
All of this is open source, free to use (and modify), and actively maintained.