Leaving Bruce in command, I refastened my tie, adjusted my professional expression, and departed the cockpit for another investigation. A flight attendant led me down the aisle to rows 12 through 15, where the vibration was the most pronounced. Slightly skeptical, I stood and placed a hand on a passenger-seat console. No imagination required — a noticeable vibration was present. For those old enough to remember the low-tech, tabletop electric football game that shook the miniature football players across the field, that’s what it felt like.