Perth International Airport — Perth, Australia

Perth Airport, coded PER, serves a city so geographically remote from other major population centers that Western Australia's capital is frequently cited among the most isolated large cities on Earth, closer in distance to Jakarta or Singapore than to Sydney or Melbourne. That isolation has shaped the airport's development, from its role as a domestic hub for Qantas and Virgin Australia to its more recent emergence as a launch point for ultra-long-haul flights, including a nonstop route to London that ranked among the longest scheduled passenger flights in the world when introduced. PER also absorbs heavy fly-in fly-out traffic tied to Western Australia's mining industry, shuttling workers to and from remote iron ore and resource sites across the state's vast interior. Multiple runways and terminals, historically split across domestic and international precincts, have undergone consolidation and redevelopment to modernize connections between them for transferring passengers.