The Clue
They travel very long distances (4 letter answer)
The Answer
UFOS
Tags
Notes
The answer UFOS is seen frequently, appearing about once every 190 puzzles.
Related Clues
E.T. carriers
ET carriers
ET transporters
Alien craft
Celestial phenomena
Controversial saucers
Eerie sightings
ETs' ships
ET's transports
E.T.'s vehicles?
Flying saucers
Roswell sightings
Saucers of a kind
Saucers, maybe
Saucers of a sort
Sky lights?
Sky mysteries
Sky sightings
Skyway saucers
Strange saucers
Strange sightings
Tabloid grist
Tabloid topics
Abduction sites, supposedly
Aliens' craft, for short
"Independence Day" fleet
Martian craft, maybe
Possible sky sightings
Potential hoax subjects
Sci-fi sightings
Sky sightings: Abbr.
Strange sights in the skies
Unaccounted-for radar blips
"The X-Files" fodder
Abductors' craft, some say
Project Blue Book subject
Some blinking lights, for short
Some streaking lights, briefly
Subject of Project Blue Book
Subjects of some 911 calls
They're encountered in "close encounters"
They're involved in some reported abductions
Definition
UFO as a noun:
1. (unidentified flying object, UFO, flying saucer) = an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins