Chinese shot it down after figuring out it was hijacked,sitting in some remote Chinese mountainside.
Imagine the loss of face if that was crashed into a monumental Chinese building or city.
And they not saying aword
maybe it already was shot down over china,protocol these days has changed for hijacked "weapons"
not wanting to incur and incidents on the ground the chinese went ahead and forced it off course then dropped it in a remote area
thats happened with several jet aircraft(cabin O2 depravation)frosty window syndrome.
happened over the states a few years back to a learjet.
crashed out in utah after running out of fuel.
ghost planes