So what LB! As far as I can tell there are only 3 people banging on about how great the American airspace experience is. Other than "thats the way the yanks do it" as an argument what would be the purpose of upending the current airspace system in Australia? It works and from what I can tell most of the Ppruners out there are happy with the way it works. The counter argument is just based on ego and a desire for bragging rights.