A search team has found the wreckage of a New York City-bound Pan Am flight more than 74 years after it crashed off Puerto Rico, killing 52 and prompting major changes in pre-flight safety procedures. The largely intact remains of the “Clipper Endeavor,” which went down after taking off from San Juan for the city Good Friday 1952, were finally discovered after a seven-year investigation led by the Air/Sea Heritage Foundation, which partnered with the Discovery Channel, according to a press release. It was found broken into two sections — with its Pam Am logo still clearly visible. The plane...