Ontario Municipal Airport — Oregon, United States

ONO is Ontario Municipal Airport, located in Ontario, Oregon, a small city near the Idaho border along the Snake River. This general aviation facility supports the agricultural Treasure Valley region, which straddles both Oregon and Idaho and is known for onion, potato, and sugar beet farming. ONO primarily serves private pilots, agricultural spray operations, and occasional business travel, without scheduled commercial airline service. The airport's proximity to Boise, Idaho, means many travelers heading to the wider region opt for the larger Boise Airport instead. ONO nonetheless remains a useful local asset for emergency services, crop dusting operations, and general aviation activity tied to eastern Oregon's farming economy.