The more one sees , and the more one reads, especially regarding the route being flown and the timing of dropping off of all comms, the more this looks like a very carefully planned and executed operation. The choice of when to go "missing" and then large changes of heading to throw off any searchers ( radar or otherwise ) .....
Looks like an insider job now from where I'm sitting , but sadly I've been wrong many times in the past, so.....