Now, this is an idea that I got watching Carl Sagan's Cosmos, many years ago, and it stuck in the back of my mind... (This looms in the background in my City entry, and I'm too sleepy to make the link right now).
So, there's this floating thing akin to a jellyfish, that just soars trough the atmosphere, till it captures some of those tubular guys, that are basically living turbines, that suck and expel air so they impulse themselves. The jellyfish is a slaver. And so it travels as a living air chariot.
I really like this piece a lot. Your rendering is exquisite, and the concept is very well done. Are they symbionts, or does the jellyfish-creature parasitize the turbine creatures?