Originally Posted By: Eugene
IIRC, and its been a while, is that RADAR isn't exactly hi-def, you simply see something vague which is why aircraft have transponders that reply with their ID. So if someone turns off that transponder the RADAR operators can't tell if its a plane or flock of birds or dense cloud0

Exactly. Lots of uncomfortable neighbors in that part of the world and there's a good chance they were on one or more country's military radars. But what showed up? Those systems are probably intended for smaller objects at a much lower altitude, and they may be aimed the wrong way. The radar manufacturer will be glad to help analyze "for a small fee". Couple all that with the fact that the military radars and their abilities and deficiencies are highly secret and that is a recovery and not a rescue operation and nobody is likely to talk much.

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Seems like they should make one transponder only accessible externally so they can't be turned off as I'm noticing that to be somewhat of a repeated theme in various hijackings and such.

In the USA we live in a remarkably safe part of the world. There are many parts of the world where it might not seem such a good idea to guarantee transponder broadcast.

There is so little data that virtually none of the theories are currently falsifiable. They generally have as many facts behind that them as "alien abduction".