I've been following this thread, but first time posting on it.
I work at an airport in Communications/Emergency Dispatch. While we are not big, we do have our weird things that happen.
Regarding the passports: A few years after 911, an aircraft came into our airport as a terminator, meaning that it would stay overnight, be cleaned, then depart the next morning.
During cleaning, 3 passports were discovered in a seat back pocket. Their pictures had been ripped out. They were from a foreign country, and it was determined the passengers in those seats had deplaned at a stop before my airport. Most likely illegal aliens, so therefore I wouldn't assume those using stolen passports on this flight were terrorists. Yes, it is a possibility, but who knows?
Most aircrafts in the US have locator alarms. I've gotten calls from NORAD regarding beacons that have been accidentally activated. I'm not sure if international flights have something like this.
I just hope and pray that when this aircraft went down, the passengers did not have to deal with the terror of going down. I am trained for a catastrophe such as this, and I hope and pray I never have to deal with it.