Likely the result of an Obama/McCain MANPAD supplied to our Al-Qaeda “allies”.
Don’t think a MANPAD can hit 31k feet. Probably a Buk again. Or something similar.
Maybe an accidental shootdown. It has happened before.
Iran Air, maybe TWA.
But by who?
A passenger carrying only Russians crashes near Syria where there is an ongoing military campaign. Looks like someone have just sent Putin a clear message.