ISIS posted a video of their shoot down of the airliner, which has been roundly ignored by just about everyone.
No. MANPADS don't have the reach, especially with the aircraft flying away from them. The video was debunked. This theory has been discussed and disproven here on FR with resident military veterans who know these things.
I don’t buy that spin. Not for a second.
ISIS was shown to have possession of SA-7 AND SA-16 MANPADS - likely from Libya after Ghadaffi was overthrown. They can hit targets at 35,000 feet and the Russian Airbus was at 31,000 when it was shot down.
Also, SA-75 Dvina Soviet MANPAD can hit targets at 82,000 feet.
2K12 Kub / SA-6 Gainful - 45k feet, another Russian design - and some accounts have those being run out of Benghazi to “Syrian rebels”.