Air magick has to do with things that are etherial. The basics envolve meditation and then devolopes into spirit work, divination, astral travel, ect. It also includes anything that is mental based like empathy and such.
Air magick is the influence and/or control of the element Air.
It is also drawing or calling on the power of that element. A master of the Air Element can call up storms, tornadoes, rain, lightning and other phenomena of the air and sky. Also could bring down aircraft, missiles etc. and probably levitate and fly once they have advanced that far.