I live in Rapid City. The aviation market here is the worst I've seen in any midwestern town. I'm fortunate enough to have a decent flying job with one of the two 135 operators on the field. As far as flying stuff goes, Air Methods runs an air ambulance operation (Black Hills Life Flight), Dale Aviation runs an air ambulance operation (Medical Air Rescue Corporation and PASSnet), and there is a small flight school that I believe is run by one gentleman who does all of the instructing. There are also a few corporate aircraft but several have shut down or seen aircraft reposessed in the last few months and a large portion are simply owner-flown single pilot operations.