Unless the Australian and American investors have very deep pockets, I'll give this show 12 months at the outside, before either (a) the non-Khmers are forced out, or (b) it shuts down completely.
The graft and corruption involved in ALL of the airlines in that part of the world are what strangle them - not only within the airline itself, but Customs and Immigration, catering, etc.
I know one of the guys (investors) involved, and wish him luck - but having lived there for as long as he has, he really is is a brave man, knowing what he knows, and what he has seen and been through before.