You can display flights from VATSIM and/or IVAO virtual airline network
You can also display real flights from ADS-B or Open Glider Network
Pilots can be filtered using their ID on IVAO or/and VATSIM network
Airlines can also be filtered using airline ICAO
Worldwide ADS-B feed available as SBS over APRS format, and BaseStation (port 30003) format
It's the feed used to populate real.flightairmap.fr
Worldwide AIS feed available as AIS over APRS format (soon)
If you contribute to a feed you can get both feeds Free (soon)