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The video of a plane exploding is at the link (it’s already being censored by youtube).
This video was taken from a figher jet with a Smart Phone. The Airliner is going over 500 mph. The only thing that could keep up is a fighter jet.
You can still watch it at this link (scroll to the bottom)
http://www.zerohedge.com/news/2015-10-31/islamic-state-claims-responsibility-russian-airplane-crash
That video looks like a real airliner exploding in air. I don’t know where they would get it if it is real and not from today, nor do I know if this can be carefully faked with miniatures or what, though it’s such poor but realistic camera quality that I would imagine it would be hard to get to look like that.
My untrained eye thinks it is from a real explosion.