Columbus Municipal Airport — Columbus, United States

Columbus, Indiana punches well above its weight in architectural fame, and CLU quietly supports the corporate aviation traffic tied to Cummins Inc., the diesel engine manufacturer headquartered in the city since the early 20th century. The airport itself is a modest general aviation field rather than a hub for scheduled airline service, with a couple of paved runways handling business jets, flight training aircraft, and private planes. Columbus earned a national reputation for modernist design after local philanthropy funded a wave of buildings by architects like Eero Saarinen and I.M. Pei starting in the mid-20th century, and visitors flying in to tour that unusual architectural landscape often arrive through this small airfield. The absence of scheduled passenger service at the field means most travelers still connect through Indianapolis, leaving CLU focused primarily on business and general aviation.