New Zealand State Highway 20 New Zealand State Highway 20 State Highway 20, also known as the Southwestern Motorway, is a New Zealand state highway linking State Highway 1 at Manukau City Centre with State Highway 16 in Point Chevalier, via Mangere and Onehunga. Along with its spurs, State Highway 20A and 20B, the state highway serves Auckland Airport, the country's largest, therefore making State Highway 20 a key arterial route connecting the airport to the wider Auckland region and most of the upper North Island. The route also forms the southern part of the Western Ring Route, a motorway route bypassing central Auckland. It
Hamilton Airport (New Zealand) operating its own full service instead. By then, the Airbus A320 was being operated. When passenger numbers dropped to an unsustainable level in August 2010, Air New Zealand ceased services to Australia. Virgin Australia attempted to fill the need for a trans Tasman service later that year with twice-weekly Boeing 737-800 flights to Brisbane; however, passenger numbers remained low and Virgin Australia ended flights on 27 October 2012. No further international flights have been made from the airport since that date. Hamilton Airport is home to the New Zealand Training Centre of CTC Aviation. CTC is a British flight training