Of more concern, simulators can teach the wrong lessons. The Federal Aviation Administration advises that when using simulators for full-stall training, “additional testing and validation of the specific FFS is necessary” in order to eliminate “the potential for negative transfer of training” to the aircraft the pilot flies. In other words, upset recovery techniques that may work in the sim may not work in LOC-I. Further bolstering the case for airborne UPRT, the FAA’s 2015 Advisory Circular on Stall and Stick Pusher Training (AC120-109A) states that the primary purpose of the platform selected is “to provide the pilot with the most realistic environment possible,” and nothing tops the verisimilitude of a real aircraft in an actual upset. That’s why several major carriers, including Delta Airlines and South African Airways, as well as a growing number of corporate flights departments, put their pilots through airborne UPRT.