Australia's airports are a joke. After a recent extended layover in Hong Kong, I took the attached happy snap of Chek lap kok airport. Like Singapore's Changi... no banal separation of arriving/departing passengers, as is the case in planet Oz.. it just works.
Now that an election has been called it's safe to assume politicians are lying to their back teeth, with one of the more laughable promises being: a second Sydney Airport
Given that endless and costly "studies", plus debate has been going on for about 40 years (FYI Chek Lap was built from scratch in about 8) I think it safe to assume no world-class airport to be built in Sydney anytime soon.