This deadly Pan American crash just north of Puerto Rico sparked today's mandatory pre-flight safety briefings.

The deaths of 52 people on the Clipper Endeavor led to the introduction of mandatory pre-flight safety briefings.

After 74 years, researchers found the wreckage of Pan Am's Clipper Endeavor 2,000 feet below the sea near San Juan.

All 69 passengers and crew members on board the plane survived the initial crash in 1952, but 52 of them later died after the plane's tail section broke off and the fuselage sank into the ocean.

The Pan American Airways Clipper Endeavor crashed in April 1952 after multiple engine failures forced a water landing ...

The crash in 1952 killed 52 people and led to requirements for the passenger safety briefings given on every commercial flight.

A team of explorers used an autonomous underwater vehicle to locate the remains of the Pan American ‘Clipper Endeavor’ about ...

Seventy-four years after a Pan Am flight crashed into the water off Puerto Rico, killing 52 people and prompting sweeping reforms including preflight passenger safety briefings, an aviation search ...

It was found that everyone survived the initial impact with the water. But passengers struggled to locate flotation gear ...

Undersea drone locates site of Clipper Endeavor disaster that contributed to introduction of briefings on emergency exits and life vests ...

The plane, the Clipper Endeavor, was carrying 69 passengers and crew when it made a hard landing on water after losing both engines less than 10 minutes after takeoff.

Unable to make it back to the airport, the captain ditched the plane in the Atlantic Ocean, roughly 11 miles northwest of San ...