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Is a Mid Air Collision consistent with what (little) we know so far? Somehow seems to be about the only possible scenario not yet discussed.
What is big enough to detach part of A321, can climb to 10 km and at the same time doesn't leave any recognizable parts on the ground after such collision?
The first two are obvious (any military jet, just for one). The second is of course a very good point (also made later by another poster).
Just trying to get a handle on the airline saying "external influence" as a cause, and the range of what that might mean.