After the Northwest merger gave Delta the Minneapolis/St Paul and Detroit hubs, Delta’s second-largest hub in Cincinnati was doomed. Terminals B and C were renamed Terminals 1 and 2. Then a new concourse C was built to the west that required a shuttle that was the home of the regional jets. And in 2010, Delta closed Concourse A and moved it entire operation into Concourse B alone. In 2016, Concourse C was razed, and you wouldn’t know it ever existed.