Quad City International Airport — Moline, United States

Quad City International Airport (MLI) is located in Moline, Illinois, and serves the Quad Cities metropolitan area spanning both Illinois and Iowa along the Mississippi River, including Davenport, Rock Island, and Bettendorf. Despite its modest size, MLI offers scheduled commercial service to major hub airports through several national carriers, making it a practical option for the region's business and leisure travelers who prefer avoiding longer drives to Chicago or Des Moines. The airport has a long aviation history dating back to the early twentieth century and has undergone various terminal modernizations over the decades. MLI also supports general aviation and occasional military and cargo operations, functioning as the primary air gateway for this bi-state metro region of roughly 380,000 residents.