Settled into the left seat at our final cruise altitude of 26,000 feet, we were showing a true airspeed of 304 knots and burning about 700 pounds of jet-A per hour. As the lush rolling landscape of central Pennsylvania slid by far below, a nagging question had entered my mind. What is it about the Beechcraft King Air family of twin turboprops, I asked myself, that keeps these airplanes rolling out of the factory in Wichita, Kansas, more than 53 years after the first one emerged? I always thought I knew the answer to that question, but there in the confines of the King Air 250’s cockpit a quiet crisis of confidence was beginning to bubble up in my mind. Who, precisely, should be buying this airplane anyway? I wondered.