From todays CASA Briefing:
Coming soon: changes to aircraft registration marks
Aircraft registration marks in Australia are changing to include a new alphanumeric system.
We use the VH Australian Nationality Mark followed by 3 alpha characters. Soon we will be introducing a 3-character alphanumeric combination such as VH-2AB, VH-A9B, VH-A22.
Introducing a 3-character alphanumeric system will mean the availability of more than 20,000 additional marks.
This will give us enough marks for at least another 30 years.
This supply maintains the current look of the registration mark and allows for sequential reservations and selective individual marks.