General Discussion

One possibility I don't see being discussed much is an on-board bomb something like the one that brought Pan Am 103 down.

Considering the massively complex political situation throughout the Middle East and between Ukraine and Russia, and a very tense relationship between the U.S. and half the damned planet, one could imagine hundreds of scenarios beginning with outright failure of the aircraft (fuel system explosion, etc.). That said, we may never know the full truth about a cause.

This one reminds me so much of Malaysia Airlines Flight 17 from 2014 that is still in international courts, with lots of people wandering about the crash site that don't look like an official investigative group.

Regardless, it's really futile to speculate at this point other than for idle conversation....