ALERT: Research team found the Pan Am flight that crashed 74 years ago, killing 52 people, and changed airline industry standards forever.A Pan Am flight on April 11, 1952, was headed from Puerto Rico to New York with 64 passengers and five crew members aboard.It crashed shortly after takeoff due to both right-side engines failing.Although all passengers survived the initial impact, only 17 were rescued, while the others sank with the plane, which investigators blamed on a lack of safety briefin