I don't think we know enough at this point to be sure of that at all (and we don't even know if it's murder/suicide.) Also I don't think you are correct about t

I don't think we know enough at this point to be sure of that at all (and we don't even know if it's murder/suicide.) Also I don't think you are correct about the Egyptair flight - that was more of a sudden dive, whereas on the Silkair flight the perpetrator intentionally disconnected the flight data and cockpit voice recorders. Just because the governments of the countries involved didn't like the outcome of the investigations (far more so in the case of the Egyptair flight) doesn't mean it was covered up by the perpetrators, this was clearly for political/religious reasons - the failure mode suggested by the Egyptian investigators was totally unsupported by evidence.