Okay, I think I should use this opportunity to explain why most of our APIs are not yet publicly available.
You see, Airsob (like our other APIs), is not our primary job. Netsob is what we do for a living: that's what pays the bill. Airsob was just a tool we built to help us send and receive SMS and we've been using it in-house for over a year now.
When we initially pitched it on Radar, we thought we could open it up to the public after a few weeks but then things became really hectic at Netsob and we no longer had the time to complete work on Airsob.
The core technology is already completely stable (like I said, we've already been using it for over a year now). It's just cleaning it up and making it presentable so that outsiders can also use it that we've not gotten around to do.
So to answer your question directly @ukay, it will definitely be publicly available. It's just the "when" that I don't know.