Dick, we have fenced on this before.
Leave it like it is (was) and there's no extra cost to industry. Any change will involve cost! Sorry, I cannot agree that changing from a 'proven system' to something else is justified because the 'cost is small.' Define
'small.'
To quote you:
Personally, I believe that airports such as Bankstown have some of the safest procedures that I have experienced in the world.
If those procedures are, truly, that safe, then where is the logic of changing to US D? 'Standardisation' just doesn't cut it if the procedures at GAAP are 'safe.'
Your words, not mine.