Passengers just pulled a hijacked 737 out of a dive at close to the speed of sound. The plane fell 17,000 feet in under a minute. Everyone on board is alive. A C-17 pilot ran the math on the flight data and got a peak around Mach 0.98. For context, the 737 MAX is certified to cruise at Mach 0.82, and in flight testing Boeing dives it to roughly 0.89 and stops there. This airframe blew past all of it with a stabbed captain bleeding in the cabin and a passenger hauling back on the yoke. So why didn't it break apart? Certification limits sit nowhere near the actual limits. Regulators require every structure on a commercial jet to survive 1.5 times the worst load it could ever see in service. When Boeing tested the 777 wing, they bent it 24 feet upward before it snapped, at 154% of maximum design load. The engineers cheered when it broke. Something close to this happened once before. Back in 1985, a China Airlines 747 lost control over the Pacific and fell 30,000 feet in about two minutes, pulling nearly 5g and flying well past its maximum operating speed. The wings bent. Pieces of the tail tore away. It landed in San Francisco and almost everyone walked off. Every extra knot this airframe absorbed today was paid for decades ago by engineers stress-testing for a day nobody could predict. A copilot with a knife found that day. The margin was waiting.