All these events are linked. They are the visible signs of an invisible, parallel world within the universe of aerospace and defense: the classified, or "black," world of secret military programs. Those unmarked 737s were ferrying employees to the flight-test center near Groom Lake, Nevada, known to the public as Area 51. The gray airplane is Polecat, a next-generation stealth unmanned aerial vehicle (UAV)-Cappuccio's video was his sly way of unveiling the program. Those earthquakes? Quite possibly sonic booms from a long-suspected hypersonic attack vehicle, a sleek aircraft that has consumed the imaginations of black-project enthusiasts and military analysts, including me, for two decades. Though seemingly dormant in recent years, the program appears to be on the move again, and with a renewed vigor that has me feeling, somewhat unsettlingly, a bit like the aerospace industry's own Ahab.