Launched around 20 years ago now, the PC-12 NG has sold consistently well for longtime Swiss airplane maker Pilatus (named after a mountain near the factory, in Stans, Switzerland). The project was far from a slam-dunk. The concept of a single-engine pressurized turboprop might sound like a natural today, but that's only because the PC-12, along with the TBM 700 (now 850), proved the concept. The concern with a big and fast single is, of course, what to do if that one engine fails. The advantage of a turboprop engine, compared with a piston, is that not only is it more powerful — a lot more powerful — but it's also a lot more reliable. Engine loss, in Pilatus' view, was an acceptably small risk. That is the argument today, and it was the argument a couple of decades ago, when Pilatus launched the bird. At the time a certain percentage of people bought it and sometimes, consequently, bought a PC-12 as well. Today, the concept of a turboprop single is a no-brainer. A friend who's been selling PC-12s since the model's inception told me that in the early days the single-engine safety discussion was a big part of the sales process, whereas now it hardly comes up.