OpenSky is available as a tracking data source to everyone and immediately
OpenSky works out of the box as a flight data tracking source and is enabled by default in the Settings > Input Channels:
Settings > Input Channels > Open Sky Network
As of 01-OCT-2021 some users with older operating systems are affected by a Let‘s Encrypt root certificate expiring. See this post for more info and options.
Enables usage of OpenSky Network as a live flight data channel. As this channel provides positional information only, OpenSky Master Data (see next row) is forced to be enabled, too, as long as OpenSky Network is enabled.
If interested find API documentation here.
For fetching master data on the involved aircraft (aircraft type, registration, operator, ...) OpenSky requires this additional channel, but it is also queried for flights read from other channels. So generally, it is a good idea to keep it enabled.