Portland International Airport — Portland, United States

Ask a frequent flier what they remember about PDX and many will mention the carpet before the runways: a distinctive teal, geometric-patterned floor covering that became such a beloved local icon that Portlanders mourned its temporary removal and celebrated its return, spawning socks, stickers, and even wedding proposals photographed on the pattern. Beyond that quirky fame, Portland International Airport serves as a significant hub for Alaska Airlines and sits along the Columbia River in the Pacific Northwest, giving travelers scenic approaches with views toward Mount Hood and Mount St. Helens on clear days. The airport has leaned into regional identity through sustainable design, including a newer main terminal roof built largely from Oregon timber sourced within a few hundred miles, reducing the building's carbon footprint. Operated by the Port of Portland, PDX also handles substantial air cargo tied to the region's technology and agricultural exports.