Have read through the previous posts - both informed and speculative.
All very puzzling.
The following questions meant in no way to distress, or cast aspersions on MH.
Fair to say that modern airliners usually only vanish during the cruise for one reason.
If there was an explosive device, then why no sign of a flash from IMINT satellites? I assume that thousands of pounds of Jet-A1 vapourising, even at that altitude would create some kind of instantaneous flash - or is a breakup in the cruise possible with no accompanying fire - I suppose it is?
And as yet, no revelations of primary radar trace of large parts of structure falling?
IIRC, one positive comment often made about the 777 is that it's a very strong air-frame. Even at circa 0.84 mach, air loads that might induce a catastrophic structural failure would surely still see large pieces left as part of the break-up sequence?
And no debris field yet.
Very strange.