Hmmm - How long have you been angry with your father?
OK, enough!!! We'll wait until there is more on this Air2 thing.
As of now: Sounds like it's only in Israel is it law, and possibly the preference of some dive operations. And tec divers and DIR don't do "Air2".
as far as I can tell the it isn't the law in Israel ether. there is a regulation that list the minim equipment for diving which ruffly translates to:
when diving with compressed gas you must have two regulators (a primary and a back up).
I'm quite sure that if you had a donate-able primary (long hose for instance) then you could dive with Air2/3 (don't think I would want to)