What I’m hung up on is that the ACARS system was turned off while still over land in Malaysia, before the pilot(copilot or hijacker) acknowledged ATC verbally before entering Vietnamese airspace.
Some basic information that I would find helpful, would be if they would allow some friends of the pilot and copilot to listen to the acknowledgment to ATC, in order to potentially confirm who was at the controls at that time.
I believe I read somewhere that it was the pilot, but I can’t find where I read that, so take it with a grain of salt.
What I have read is that this was possibly intended to buy time...because they were in between air spaces, apparently, before things got more suspicious. Some aviation forums I was reading the other night...