has the possibility of a drone hitting the aircraft been explored? That may explain the exuburance of so many international navies being involved
As the passport angle is being investigating more, it should also be noted that many countries in SE Asia still don't have the new style passports with embedded chip. It's realitively easy for people to get passports in this neck of the woods, as I have seen from various "helpers" leaving one country to go home and then coming back under a new passport with different name and birth dates..