This is a nice mod! But since the crafting recipes are hidden, it can take a lot of research and experimentation to discover what kinds of things you can make with the air everything mod. But when you do discover something, it's usually pretty cool!
My favorite so far is the Flying Air Carpet, crafting recipe:
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When you craft the Flying Air Carpet, be careful to note where you put it in your inventory because it's easy to lose track of it since it's invisible. Wield the Flying Air Carpet, climb to the highest spot you can find, and jump, immediately right clicking the carpet.
The Flying Air Carpet allows flight, but with some severe restrictions. You can not fly up, only down. You can control direction a bit with the directional keys, but you have no control over velocity, which increases the further you get from your jumping off spot. And there is no way to stop the Flying Air Carpet except for running into some object, which can be quite an impact after a long flight, so be prepared.
There seems to be a bug that occasionally causes the flight to stop if you hit an unloaded chunk, but this can only be seen on long flights.
The Flying Air Carpet is very limited, but still, since it didn't cost you anything but air, I think its a pretty powerful item.
Has anyone else discovered some of the other really cool things you can craft with this mod?