Red Stewart Airfield (ICAO: 40I) is a small, privately owned general aviation airport located near Waynesville, Ohio, in Warren County. It is well known in the regional aviation community for its grass runways and old-fashioned character, evoking the early days of flight. The airfield is a popular destination for vintage aircraft enthusiasts and student pilots, and it hosts fly-ins and other small aviation events throughout the year. It operates primarily as a base for recreational flying, flight training, and itinerant general aviation traffic. Red Stewart Airfield is family-owned and has been operated by the Stewart family for decades, giving it a distinctive grassroots identity among Ohio's general aviation airports.