Juneau International Airport — Juneau, United States

JNU is the code for Juneau International Airport, serving Juneau, the capital of Alaska, a city uniquely accessible only by air or sea due to surrounding mountains and glaciers with no road connection to the rest of the state's highway system. The airport is a critical lifeline for the capital, handling scheduled jet service from Seattle and Anchorage as well as extensive floatplane and helicopter operations supporting Juneau's tourism industry, including flightseeing over the nearby Mendenhall Glacier. JNU also plays an essential role in state government travel and cargo delivery, given Juneau's isolation from Alaska's broader road network.