No, never even heard of it. Air layering... Sounds adventurous. I do have citrus trees, five of them, so maybe I should look it up and see...
I have some garlic chives somewhere in the garden. A friend gave me a few and I put them in a pot on the wall, and I think that one got overgrown by Physalis and the climbing rose. I have to look for it...
I think you'll be excited with air layering. I'm going to try today
Looked it up, definitely going to try it out.