Summary time
Signal to noise on these threads becomes a problem very quickly.
Declaration: interested civilian with no qualifications to propose theories.
But, can anyone state for certain:
1). Is the rapid descent and turns a fact? Does anybody the source? e.g. the location of the radar - was it radar or a trace of transponder or other transmissions?
2) Last know definite position - not based on tracks that have been through software and are prone to extrapolations between updates.
3) Media sources state the flight level as 370 but have various times to run until landing, ranging from 20 to 30 mins. AT what point would you expect a descent to start? Is the flight level and last know position what you would expect on this flight plan?
Thanks in advance.