Frankfurt-Hahn Airport — Frankfurt am Main (Lautzenhausen), Germany

Once a Cold War-era American air base tucked into the forested Hunsrück hills, HHN found a second life as a civilian airport after military forces withdrew, eventually becoming a magnet for low-cost carriers like Ryanair despite sitting roughly two hours by road from Frankfurt itself. That naming choice, pairing Frankfurt's globally recognized brand with an airport nowhere near the city, drew criticism and occasional legal disputes over the years, yet the budget-fare model kept passenger numbers respectable for a facility so far outside a major metropolitan area. The surrounding Hunsrück region is sparsely populated and rural, a stark contrast to the runway's origins hosting fighter squadrons during decades of Cold War tension. Cargo operations have also found a niche here, taking advantage of lower fees and less congested airspace than the main Frankfurt Airport experiences daily. Its future has periodically come under financial scrutiny from regional authorities.