Boise Air Terminal/Gowen Field — Boise, United States

Boise Air Terminal, also known as Gowen Field, carries the code BOI and serves Boise, the capital of Idaho. Sitting at an elevation of 2,871 feet, the airport operates two runways, sharing its grounds with the Idaho Air National Guard, making it one of many American airports with a dual civilian-military role. The field has seen steady passenger growth alongside Boise's expansion as a technology and business center in the Mountain West, with several national carriers adding capacity of late. Major domestic airlines connect BOI to hubs across the country, and the terminal has been expanded to add gates, parking, and a larger security checkpoint area. Beyond commercial service, Gowen Field remains an active military installation, with Air National Guard fighter units flying from the same runways used by passenger jets, an arrangement common at fields that trace their origins back to World War II-era airfields built for pilot training.