Originally Posted by damnedeyez
Well, it's possible another species can airbend...and just haven't been found or taken notice of. Hell, waterbending was learned from the Moon...maybe airbending can be learned from the east wind or a spirit associated with wind.
It's funny, I have always had a problem with water bending since its not based on an animal like the other elements. Of course, it just makes sense.
They could go the route that fire benders did. In the series, the only "pure" fire benders was Zuko, Iro and the people on Dragon Island (I'm sure there are others from before the dragon purge). All the rest used their emotions/rage (Azula) to bend fire, so its possible to learn to bend other ways than the "original masters."
Also, don't forget that blood and metal bending are forms that were variations from the original, so I guess anything is possible.