Dick, not closed as you are to any argument not of your origin.
WLM? RAAF? fast movers? and you think it is OK to fly through that airspace with no radio? This wasn't intended as a trap, I was only highlighting a situation that a blunder can be made and yet still continue LEGALLY through some pretty busy airspace....Risk assesment? Current situation, you know from your training you do not continue unless you have made contact...even if the answer is NO...You know what to expect. (Iconsider this as the same argument as the lottery that is monitoring an appropriate frequency.)
Implied clearances may be fantastic to save a couple of verbs over the radio on a quiet day. However, when things get busy, the chatter is still at the same level as currently (or was currently) on GAAP tower frequencies...The changes to ICAO D is a retrograde step in provision of a service for heavy RPT... Dick, you asked for no less at AV...you didn't ask for FAA D there. As ARFOR has pointed out again...all those busy aerodromes are nonRPT aerodromes just like our GAAP.....what happens if BAL do get their way and start up RPT services with BAE type Jets...would you still like FAA D control with BAE types on RPT mixing it with foreign students trying to master the english language as well as learn to fly?