I think at this point nothing is off the table. It could be an accident, a hijacking or, I hate to say it, a crime with pilot involvement. One thing that strikes me as odd is if this was some sort of hijacking / suicide mission, it would've ended soon without shutting down com equipment. The plane flew for hours, dodging radar. I believe there was / is a bigger plan; but I'm no expert...just my take with the info available.
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