"If this plane was indeed hijacked and landed safely somewhere, It would be a huge task to supply food, water and medicine for 200 plus people for the last 11 days or so. "
not that big.
one container would give you supplies for weeks for 200 - basic.
if you wanted to really look after them then yes, it would be a little more complex - medications etc.
but basic food and water and maybe even shelter - that isn't a big task - especially if you are putting equipment and transport on the ground anyway to unload cargo.
It really depends on motive - it this were a robbery - would they care about the people? I would. Why risk being done for manslaughter as well as theft?
After all, lets face it - if someone swiped a whole plane with a valuable cargo and got away with it - AND looked after the passengers - they would go down in history as famous and probably hero's ---------- if they killed everyone or left them out in the boonies - they would get no sympathy and history would look very darkly at them.
It really isn't a big deal to feed/water and house 200 people for a few days.