I don't quite understand this.
2 days later and "authorities are telling the families to prepare for the worst".
The plane is gone, the people are dead. It's not like it's bobbing in the ocean waiting for rescue... or it's been hijacked and landed somehow undetected in a cornfield because someone wanted a lift elsewhere.
It was either blown up, or it was ripped to pieces in the air due to a catastrophic mechanical problem.