Four runways criss-cross the grounds of the Cincinnati/Northern Kentucky International Airport (CVG). Among them, in an island by itself, is the former "Concourse C." Once a gateway containing portals to destinations across the United States - it now sits quietly with luggage lining the hallways and benches stacked atop each other in closed shops and eateries. The lonely aerodrome is absent of both people and flights, both of which have relocated to the airport's main facilities.