Adak Airport — Adak, United States

Adak Airport sits just 18 feet above sea level on Adak Island, far out along Alaska's Aleutian Island chain, where a single runway serves one of the most remote medium airports in the United States, closer to Russia than to most of the American mainland. The Aleutians stretch for hundreds of miles into the North Pacific, and Adak is among the westernmost communities with any scheduled air service at all. Near-total absence of road or ferry alternatives connecting Adak to the rest of Alaska leaves this airport as the community's essential link to the outside world.