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yes
Australian pilot Frederick Valentich sent a radio transmission to the control tower descibing a UFO that was orbiting his Cessna plane. His last words were 'it's not an aircraft'. Then nothing. Valentich was never found nor was his plane.
The Disappearance was created in 1977.
"Disappearance" has four syllables.
Chronicle of a Disappearance was created in 1996.