I'm calling faulty altimeter as the cause. Lack of debris leads me to believe it flew straight into the ocean like a dart and vanished as the plane failed to recognize the curve of the earth
That's far less likely than a terrorist bomb simultaneously set off by two people from different countries who were both using stolen passports.
The stolen passports were from different countries. The two actual terrorists could be from the same country. It could indicate the work of an organization which has cells throughout the world. Say someone like al Qaeda
Both passports were stolen in Thailand.
And the people using them would have to be able to pass as Christian and Mario....