Probably like any VIP visiting Perth in their corporate jet, they have to clear customs.
Wonder if they are required to walk across the tarmac dodging baggage trolleys, clamber through the bowels of the terminal for a "welcome to Australia" stamp from some sour faced official, then trot back to their jet and taxi to the FBO...
Ahhh!!! Australia.... One of the few third world countries where you can drink the water!!