system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar] What powers airbending?

We know from the show that firebending is powered by the sun and waterbending by the moon. Also, according to word of god, earthbending is powered by plate tectonics and the energy of fault lines. What is the power source of airbending?
gpt
Well you've got all these separate entities responsible for or aiding bending - fire with the Sun, water with the Moon, and earthbending with well, the Earth. So possibly airbending has its source with the spirit world. Airbending is the most spiritual element, and you generally won't see spirits, so it's plausible that some spirit force could be powering airbending.