Gawler Bypass to Port Wakefield Road at a point a few kilometres north of the Port River Expressway connection. The Northern Connector, completed in 2020, links the North South Motorway to the Northern Expressway. Airports The Adelaide metropolitan area has two commercial airports, Adelaide Airport and Parafield Airport. Adelaide Airport, in Adelaide's south-western suburbs, serves in excess of 8 million passengers annually. Parafield Airport, Adelaide's second airport north of the city centre, is used for small aircraft, pilot training and recreational aviation purposes. Parafield Airport served as Adelaide's main aerodrome until the opening of the Adelaide Airport in February 1955. Adelaide Airport serves many international and domestic destinations including all Australian state capitals. Adelaide is also home to a military airport, known as Edinburgh Airport, located in the northern suburbs. It was built in 1955 in a joint initiative with the United Kingdom for weapon development. Health Adelaide's two largest hospitals are the Royal Adelaide Hospital (RAH) in Adelaide Parklands, a teaching hospital affiliated with the University of Adelaide (800 beds), and the Flinders Medical Centre (580 beds) at Bedford Park, affiliated with Flinders University. The RAH also operates additional campuses for specialist care throughout the suburbs including the Hampstead Rehabilitation Centre (150 beds) at Northfield and the Glenside Campus (129 beds) for acute mental health services. Other major public hospitals are the Women's and Children's Hospital (305 beds), at North Adelaide; the Queen Elizabeth Hospital (340 beds) at Woodville; Modbury Hospital (178 beds) at Modbury; and the Lyell McEwin Hospital (198 beds) at Elizabeth Vale. Numerous private hospitals are also located throughout the city, with the largest operators being not-for-profits Adelaide Community Healthcare Alliance (3 hospitals) and Calvary Care (4 hospitals). In 2017, the RAH was relocated from the city's East End to a new AU$2.3 billion facility built over former railyards in the West End. The state-of-the-art hospital forms part of a new biomedical precinct called BioMed City that collocates the South Australian Health and Medical Research Institute (SAHMRI), the University of Adelaide Health and Medical Sciences building, the University of South Australia's Health Innovation Building, and the state's Dental Hospital. SAHMRI is building a $300 million second facility due to be completed by 2022 to house the Australian Bragg Centre with Australia's first proton therapy unit. There are also plans for the Women's and Children's Hospital to be relocated to the precinct adjacent the RAH by 2024.