Why do people immediately associate the acronym UFO to mean an alien craft? U.F.O stands for Unidentified Flying Object. It could just as easily be a foreign nation's aircraft and not some otherworldly visitor.
This is, once again, the lamentable problem of a term used technically in a specific field (in this case, by pilots) being usurped by the general public for use in a way that wasn't originally intended. Like the word theory.
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