Restricting entry to more easily controlled entry points is one way, and it also enables a much higher level of service to be provided at those points.  Decentralising services to those specialised transport hubs can also offer populations a reason to move away from the densely populated cities and into regional areas.

If Dubbo was a traffic hub, with an international airport, a railhead and a road transport hub, linked with others at Toowoomba, Townsville, Broome and Adelaide, this would enable:

1. A total customs and quarantine environment – able to be totally isolated until clearance was obtained.  This could be for air cargo, as well as human travellers and bring a new level of security into the air transport industry.  Drug and contraband detection par excellence could be built into the facilities on a level previously not known, and provide protection not previously available at airports.
2. Bulk passenger arrivals from international destinations in the largest passenger aircraft, with a parallel domestic service delivering passengers in smaller, quieter aircraft specifically to the destinations they wanted to reach without congesting those destinations.  In these particular international airports, there would be no limits on airport runway lengths or curfews.  Weather is also much more predictable away from the coastal regions, with less chance of air traffic arrival or departure delays.  Accommodation infrastructure would be built to support the airport capacity.
3. Currently overcrowded air and terminal spaces at major capital city airports of Melbourne, Sydney and Brisbane would be relieved and domestic only aircraft would be landing there on regular schedules.  However, for Heads of State such as the US President with his Air Force One Jumbo, the capacity of the airport is still available for the larger aircraft, and airspace security would be further enhanced.
4. Aircraft servicing facilities could be built in these lower infrastructure cost areas, further decentralising expertise and population.  Rather than sending aircraft offshore for servicing, with the lower overheads possible, servicing of aircraft could become an industry that brings other airlines and business into Australia.
5. Air Traffic Control would also be simplified and safer with fewer terminals, in more widely dispersed areas, with specifically international traffic only corridors and domestic traffic only corridors.  This also brings a new level of security into anti-terrorism management.  A 9-11 style attack would become very difficult to coordinate with such a well-coordinated air traffic control system.
6. Location of Air Defence Forces in nearby locations and “over the horizon” radar could also facilitate air traffic control, other sea and air traffic movements and any other ground movements in the regions.  This, in coordination with a Coast Guard service as detailed elsewhere in these policies, would complete a coastal defence system and network of services.

Should this network develop, in conjunction with the transport hub concept, it would be a radical rethink of airports, transport and traffic movements within Australia, and precipitate the next evolutionary step in the development and decentralisation of Australia as a nation growing and taking its place in a growing, international marketplace.