The US system is about making it work rather than following to the letter the musings of some ICAO RT sub comittee. When you have the sheer volume of traffic that the US has on frequency at times the whole ICAO proceedures dont actually work as they are to verbose. As said before it's not like they are banging in airliners all that often. In recent times I have heard even domestic Australian pilots breakout the US RT proceedures when frequencies get congested. Seems to work much better!
Last edited by neville_nobody; 11th Jul 2013 at 23:31.