1990 Mexico Air Incident

In 1990 an Air Mexico flight traveling over the Atlantic Ocean experienced something so terrifying that the crew of the plane agreed never to speak
of it for fear of reprisals.

The events of which did eventually come to light when a flight attendant aboard the plane reached out to Mexican UFO researcher Luis
Ramirez Reyes would write of this case in his book "A Caso Extraterrestrial".

The case is beyond strange and brings to mind the classic Twilight Zone episode, "Nightmare at 20 thousand feet".