Airservices Australia has 29 air traffic control towers and two air traffic control centres based in Brisbane and Melbourne. Australia has two Flight Information Regions which are managed by these centres. All airspace to the north of the dividing boundary (YBBB) is controlled by Brisbane Centre and all airspace to the south of the boundary (YMMM) is controlled by Melbourne Centre. These centres cover the whole of Australia with the exception of Perth and Sydney Terminal Control Units as well as the towers at major airports. In addition, Melbourne Centre is responsible for managing traffic handovers from South Africa, Mauritius, Sri Lanka, Maldives, Indonesia and New Zealand. Brisbane Centre manages traffic handovers from neighbouring flight information regions including East Timor, Papua New Guinea, Fiji and United States.