It could be that having landed intact (albeit perhaps not in an airworthy condition) the hostages may be on their way to some safe secluded place where their life needs are met with no means of escape or communication.
riiight.....
So, not only have they managed to land and hide 300 tons of aircraft from the worlds eyes from over a week, but they've also managed to discreetly transport 300 people to a different location which is basically (by your description) a fully equipped, self-sufficient prison building they've also taken over, and have been catering to their every need for a week without communication or being spotted.
