It seems there might be some confusion or misinformation here. There’s no record of a Pan American plane crash involving a collision with a UFO resulting in such a catastrophic loss of life.

Pan American World Airways, commonly known as Pan Am, was a prominent American airline that operated from 1927 to 1991. While Pan Am did experience some tragic accidents throughout its history, none of them involved a collision with an unidentified flying object (UFO) resulting in the loss of 50,000 lives.

UFO sightings and reports of encounters are a separate topic that has fascinated many people over the years, but there’s no verifiable evidence to support the claim of a Pan Am plane crash caused by such an incident.

It’s important to rely on credible sources and factual information when discussing historical events or accidents involving airlines and to avoid spreading misinformation or unsubstantiated claims. If you have any other questions or topics you’d like to explore, feel free to ask!