John Glenn Columbus International Airport — Columbus, United States

Ohio's capital city renamed its main airfield in 2016, retiring the long-used Port Columbus name in favor of honoring John Glenn, the Ohio-born astronaut and US senator who became the first American to orbit Earth. CMH sits just a few miles east of downtown Columbus, making it unusually convenient compared with many similarly sized American cities where the airport sits far from the urban core. As Ohio's state government seat and home to Ohio State University, one of the largest universities in the country, Columbus generates steady business and leisure demand that has kept the airport growing even without functioning as a major connecting hub for any single carrier. Two parallel runways handle a route network weighted heavily toward domestic destinations, supplemented by a modest slate of seasonal or limited international service. The airport also anchors a significant logistics and air cargo operation, benefiting from Columbus's central location within a day's drive of a large share of the US population.