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 plane crash that led to mandatory passenger safety briefings, was discovered off Puerto Rico using an autonomous sonar drone. The crash, which killed 52 people, prompted changes in aviation safety protocols, including preflight instructions on life vests and emergency exits. The discovery may aid families of other missing flights, like Malaysia Airlines Flight 370.