There is a major ISIS contingent in the area of the crash armed with advanced AA missiles smuggled in from Libya ... Don’t know whether those missiles can reach to 20-30,000 ft. Retaliation for Russian bombing in Syria?
If this was shot down, I don’t expect the perpetrators to claim they did until they are about 50 miles away and upwind.
Isis is supported by Saudi Arabia which is right across the water from the Sinai peninsula. Stinger sam can go 26k up.
question....who wants to piss off the Russian Bear?