You can use 'circumvent' here, but the meaning is a little odd. That's more like heading from Mars to the Sun and finding a way around the Earth to continue to your destination. Usually, people use 'circumnavigate' instead, which is used to describe vehicles (boats, planes, bicycles, etc.) making their way all the way around Earth.

Presumably they could also be rented for big commercial outdoor events, too. On a grander scale, maybe these might make a big network like the old Project Loon more feasible, though presumably the things would have to be able to fly high enough to escape most of the weather (and vandals and conspiracy theorists armed with rifles).

If you ever dig through Tarana's patents, what you'll come across is more or less what you're describing.

At first sight I read 'nuclear' instead of 'not clear' and I got scared. Then I though about it again and... sadly it could also be true.