Given that the ads-b snap is used for demodulating signals received via a USB receiver and that use of raw sockets is required for full functionality, use of raw-usb and network-observe seem reasonable for this application. +1 from me for auto-connect of raw-usb and network-observe.
+1 from me too - these are primary functions for this snap and would not be unexpected from a user point-of-view for the snap to be auto-connected to raw-usb and network-observe.