Western Sydney International (Nancy-Bird Walton) Airport — Sydney, Australia

Western Sydney International, given the airport code WSI and formally named Nancy-Bird Walton Airport after the pioneering Australian aviator, is being built at Bringelly on the western fringe of the Sydney metropolitan area to give the region a long-planned second major gateway. Its core purpose is to relieve pressure on the constrained, curfew-bound Kingsford Smith Airport in Sydney's inner south, giving western Sydney's rapidly growing population direct air access without a long cross-city trip across town. Unlike the older airport, WSI is planned to operate around the clock without a curfew, positioning it as a significant freight and passenger gateway as well as the anchor of the surrounding Western Sydney Aerotropolis development zone, which is intended to bring housing, logistics and business precincts alongside the runway. Early plans envisage a single runway with substantial room for later expansion as demand grows through the following decades.