Or whatever it is called when you land on water like Sully.

I don't think there is much we can be certain of at all, though.

I guess the difference could turn on whether or not the crew and passengers (or at least a majority) survived the event. But, you're right, we just don't know...

which disappeared that was not eventually found.

Which is totally, utterly different from an in-service passenger airliner disappearing in the middle of a flight with over 200 people on board.

As I've said, every single other similar instance of a larger passenger airliner disappearing while in service has been solved.

all the people on the plane are still alive and unharmed somewhere.

There are too many places where air traffic would have picked up an unidentified blip...And they would have been flying low, so their fuel burn would have been incredibly high -- So factor in a shorter range....

And let's get serious -- It DID NOT go anywhere near Japan, China or India, because those nations would have scrambled jets pretty quickly (unless one of those countries are in on a ruse)