Wreckage found of Pan Am plane crash that helped lead to today's safety briefings on every flight

The wreckage of Pan Am's Clipper Endeavor, a 1952 crash that influenced modern flight safety briefings, was discovered off Puerto Rico using an autonomous sonar drone. The crash, which killed 52 people, led to the development of preflight safety instructions after survivors reported chaos during evacuation. The discovery could aid families of other missing flights like Malaysia Airlines 370.