We were headed back toward austin's class charlie airspace from our demo flight out to the west in a Commander 115, though it wasn't just any Commander 115. At the time it was the only one like it in the world. The frequency was pretty quiet. We were at 5,500 feet, about 25 miles out when one of the Austin Approach controllers gave us a call, "N115CE, say type of aircraft." "N115CE is a Commander 115." "Uh, roger, is that a single-engine or a twin-engine aircraft?"
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