Security researchers found that in less than 60 seconds, they could open a hatch on a plane’s exterior, plug in a tiny device, and redirect the aircraft’s autopilot or sabotage its flight plan.Photo-Illustration: Jobanny Cabrera; Getty ImagesEven as the digital components of so many life-critical systems have proven susceptible to cybersabotage—cars, medical devices, even water utilities and power grids—the computer systems of airplanes have, thankfully, remained uniquely inaccessible to hackers...