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Any idea what might happen if they took down a plane? Would it have been their "fault"?

I know the chances are something like a trillion to one.

Every day hundreds of weather balloons around the world get launched for weather forecasts. There have been reports of sightings by planes, but never any collisions.

Air traffic control are aware of the locations where balloons are launched. In the UK at least, you must notify them before a launch.

Thanks for that. They probably launched from an area where they were allowed to/usually did I guess.

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