There are several posts about this topic, e.g. FlightAirMap (ADSB) - geojson custom component or FlightRadar24 as an Add-On?, and it really comes down to what you want to do.
For tracking specific flights you could use a geolocation based integration, but if you are more interested in the number of tracked flights or just in general to monitor your receiver, then a rest sensor and some template sensor to extract the data is the way to go.