No Wishi. In the US the airline simply makes an announcement "VFR aircraft overhead yyyyyy at 3500' if copying ,request call LAX Centre on XXX.XX."
Yes. The FAA has ground outlets at some locations on 121.5 but can and does use higher flying aircraft ( or intercept fighter) when an aircraft being called is not within coverage of a ground station. In Australia with our lower traffic densities we can save the cost of 121.5 ground stations by using existing aircraft radios.
In Aus I sometimes hear ATC calling a VFR aircraft on the map marked area frequency for different reasons. Often communication is not established. Probably because the pilot , after making 7 or 8 en route frequency changes, mis dialed the 9 th freq ! In the US just leave the radio on 121.5 if not flying in the approach or departure area of a marked CTAF.
Hope you are not looking for a way of making sure the simple FAA system can't work in Australia.
Last edited by Dick Smith; 17th Apr 2016 at 06:07.