Gimhae International Airport — Busan, South Korea

Gimhae International Airport, identified by the code PUS, serves Busan, South Korea's second-largest city and busiest seaport, from a site along the Nakdong River delta southwest of downtown. It ranks as the country's second-busiest airport after Seoul's Incheon, handling a mix of domestic trunk routes and a growing slate of international connections across Japan, China, and Southeast Asia. Korean Air and Busan-based carrier Air Busan anchor much of the traffic, and the airport shares its runways with a Republic of Korea Air Force wing, a legacy of its dual military-civilian origins. Because Busan sits far from Seoul and functions as a distinct economic and cultural hub, PUS carries outsized importance for southeastern Korea's trade and tourism. Long-discussed plans for a new offshore airport on Gadeokdo Island reflect both its capacity constraints and Busan's ambitions to host larger international events in future decades.