This sounds fascinating. I would totally invite them in.

It also reminds me of a horror story I read that had been written before heavier-than-air flight became possible, but seemed within reach. The story had been written just a few years before the Wright brothers success at Kitty Hawk.

The author imagined ferocious jellyfish-like creatures that lived in the upper atmosphere, and kept themselves aloft with gas-filled bodies. Interesting idea.