something missing,
Is the area covered by SSR and ADSB?
seems -yes.
If aircraft stalled ,Transponder would work.
There is no info ( other the last post that anyone noticed descent )
If it is SSR covered and aircraft stalled than ATC will see aircraft fall ( albeit I pray to Good to save us of such views ) all the time ,or at least until radar coverage lower limit. Lower limit could be anything but it should be at least FL 100.
So If it was stall, ATC would see FL 330,FL327..... FL100....
If it is desintegration ,intentional turn off comms and transponder than it might happen FL 330,FL327 and than nothing without any frequency warning or similar.
i think that the same is applicable for flightradar and other modern applications ...
