"E000" you hit the nail on the head there "1 Capitol City 1 Airport. Apart from Avalon Airport which really is a dead loss the Capitol City Airports have a monopoly & they know it. Captive market, wouldn't a lot of major businesses love to be in that situation!
Take a look at Tulla, the joke airport of the country. The taxiway improvements that have been going on since DC3's where designed are still being constructed at 1 cubic meter of concrete a month where as the new T4 & associated car-parking infrastructure is going up like gangbusters, they know where the $$$$ are! Although as a side note I heard the other day true or false that construction had halted on the T4 & car park due the toilet facilities had broken down & the union didn't want it's members having to walk up to the terminal to use the dunny's...gotta luv Australia!:-)
The status quo will continue for sometime yet with no foreseeable change in the future inc Badgery's Creek, that's so far off & likely to be a lemon if ever it's constructed that it doesn't even figure am sure in the Airlines next 10 yr planing model.
'SN' that's not as silly as it sounds!
Wmk2