Phoenix Sky Harbor International Airport — Phoenix, United States

Phoenix Sky Harbor International Airport, coded PHX, carries a name older than its current ownership, originally applied to an early private airfield decades before the city of Phoenix acquired and expanded the site into its present form. Unusually for a major American hub, PHX sits just a few kilometers from downtown Phoenix, giving travelers a notably short commute compared with many peer cities where airports sit far from urban cores. American Airlines operates its largest hub at PHX, a legacy of US Airways, which built extensive connecting traffic here before merging with American in 2013. The airport handles the Sonoran Desert region's intense summer heat, with runway performance calculations sometimes affected by extreme temperatures that can approach or exceed 47 degrees Celsius during the hottest stretches of the year. Surrounding mountains, including Camelback Mountain and South Mountain, frame dramatic approaches into the valley below.