Some 74 years after a Pan ​American Airways flight crashed into ​the water off the coast of ​Puerto Rico, an aviation search team said it found the wreckage sitting on the ocean floor.The Air/Sea Heritage Foundation and ‌others, including Discovery ⁠Channel's series "Expedition ⁠Unknown," found the wreckage of the Pan Am "Clipper Endeavor" at the bottom of the Atlantic Ocean off Puerto Rico's northern coast last month, Discovery said on Tuesday.Read more: Pan Am to return in 2025 for exclusive flight. Know its fare, schedule, itinerary and moreThe Douglas DC-4 aircraft broke into two sections and came to rest after crashing into the ocean ⁠shortly after ‌taking off from Puerto Rico on April 11, 1952, with 64 passengers and five crew ⁠members on board.While everyone on board survived ​the initial impact, only 12 passengers and ​five crew members were rescued, with the rest being lost with the plane.The disaster led to sweeping aviation reforms, with the introduction of pre-flight safety briefings and emergency procedure demonstrations."We are all stunned ‌and elated by this discovery yet also humbled to remember what happened in that ​place so ​long ago," said Russ ⁠Matthews, president of the Air/Sea Heritage Foundation.Read more: 1986 Pan Am hijacking: Ministry of External Affairs may raise issue of compensation with United StatesThe search, which involved the Deep Sea Vision company, used high-resolution sonar, with the wreckage being found almost 2,000 feet under the Atlantic Ocean.The search also involved the use of autonomous underwater drones and ended the mystery of where the aircraft came to rest.