Republic kept North Central's hubs at Detroit and Minneapolis, and Southern's hub at Memphis. Within a few years, they closed the former Hughes Airwest hub at Phoenix and also largely dismantled the Hughes Airwest route network in the western U.S.; they also reduced North Central's sizeable station at Chicago-O'Hare. Southern's sizeable station was also reduced at Hartsfield at Atlanta. Republic also quickly downsized North Central's operations to and among smaller airports in the upper Midwest, concentrating their fleet at the Detroit and Minneapolis hubs.