Crossword Genius

Sci-fi conveyances (4)

Ross

I believe the answer is:

ufos

(Other definitions for ufos that I've seen before include "Unauthorised traffic from outer space?" , "Mysterious objects in sky" , "Supposed spaceships" , "Roswell sightings?" , "Strange aerial objects" .)

I've seen this clue in The New York Times.
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