| UFOS | "Arrival" vehicles |
| UFOS | "Arrival" vehicles, for short |
| UFOS | "Close Encounters" hoverers, briefly |
| UFOS | "Independence Day" craft |
| UFOS | "Independence Day" fleet |
| UFOS | "Independence Day" fleet, for short |
| UFOS | "Independence Day" vehicles, for short |
| UFOS | "Mars Attacks!" ships |
| UFOS | "The X-Files" fodder |
| UFOS | "The X-Files" sightings, for short |
| UFOS | "X-Files" topics |
| UFOS | ''Independence Day'' fleet |
| UFOS | 27-Across carriers |
| UFOS | 59-Down carriers |
| UFOS | Abductees' destinations, in some hard-to-believe stories |
| UFOS | Abduction sites, supposedly |
| UFOS | Abductors' craft, some say |
| UFOS | Aerial enigmas |
| UFOS | Airborne anomalies |
| UFOS | Airborne mysteries |
| UFOS | Airborne saucers |
| UFOS | Alien conveyances |
| UFOS | Alien craft |
| UFOS | Alien crafts: Abbr. |
| UFOS | Alien ships: Abbr. |
| UFOS | Alien spacecrafts: Abbr. |
| UFOS | Alien spaceships |
| UFOS | Alien spaceships: Abbr. |
| UFOS | Alien transport |
| UFOS | Alien transporters: Abbr. |
| UFOS | Alien transports |
| UFOS | Alien transports: Abbr. |
| UFOS | Alien vehicles: Abbr. |
| UFOS | Aliens' craft, for short |
| UFOS | Aliens' crafts: Abbr. |
| UFOS | Aliens' ships: Abbr. |
| UFOS | Aliens' vehicles: Abbr. |
| UFOS | Area 51 conveyances? |
| UFOS | Area 51 holdings, supposedly |
| UFOS | Astounding Stories subjects |
| UFOS | Blurry images in tabloid photos, for short |
| UFOS | Causes of some 911 calls |
| UFOS | Causes of some mysterious radar blips, in brief |
| UFOS | Celestial sightings |
| UFOS | Cosmic craft |
| UFOS | Cosmic vehicles: Abbr. |
| UFOS | Craft in many conspiracy theories |
| UFOS | Crafts in "Close Encounters of the Third Kind": Abbr. |
| UFOS | Crafts in a "close encounter of the third kind" |
| UFOS | Crafts used in alien abductions: Abbr. |
| UFOS | Curiosities that often turn out to be drones: Abbr. |
| UFOS | Curious sightings |
| UFOS | Discs in tabloid pics |
| UFOS | E.T. carriers |
| UFOS | E.T. vehicles |
| UFOS | ET carriers |
| UFOS | ET rides |
| UFOS | ET transporters |
| UFOS | ET transports |
| UFOS | ET transports: Abbr. |
| UFOS | ET vehicles |
| UFOS | ET vehicles, in theory |
| UFOS | ET vehicles: Abbr. |
| UFOS | ET's transports |
| UFOS | ETs pilot them |
| UFOS | ETs' ships |
| UFOS | ETs' spacecrafts |
| UFOS | ETs' transports |
| UFOS | ETs' vehicles |
| UFOS | ETs’ ships |
| UFOS | Eerie aircraft |
| UFOS | Eerie fliers |
| UFOS | Eerie hoverers |
| UFOS | Eerie saucers |
| UFOS | Eerie sightings |
| UFOS | Eerie sightings, for short |
| UFOS | Extraterrestrial ships |
| UFOS | Extraterrestrial vehicles: Abbr. |
| UFOS | Fantastic craft |
| UFOS | Faraway fleet? |
| UFOS | Fleet from far away |
| UFOS | Fleet from far away? |
| UFOS | Fleet from far off? |
| UFOS | Fleet from faraway? |
| UFOS | Fleet from outer space? |
| UFOS | Flying saucers |
| UFOS | Flying saucers (inits) |
| UFOS | Flying saucers: Abbr. |
| UFOS | Flying vehicles with tractor beams, perhaps: Abbr. |
| UFOS | Focus of the U.S.A.F.'s Project Blue Book (1952-1969) |
| UFOS | Foreign dishes? |
| UFOS | Freaky fliers |
| UFOS | Freaky flyers |
| UFOS | Govt. secrets? |
| UFOS | Hover craft? |
| UFOS | Hover crafts? |
| UFOS | Hovering craft |
| UFOS | Hovering flyers |
| UFOS | Hovering saucers |
| UFOS | In 2021, the U.S. Department of Defense established a group to examine them (abbr.) |
| UFOS | Inexplicable sights in the sky: Abbr. |
| UFOS | Inexplicable sights up above: Abbr. |
| UFOS | Intergalactic vehicles: Abbr. |
| UFOS | Interplanetary craft, for short |
| UFOS | Little green men's vehicles: Abbr. |
| UFOS | Martian craft, maybe |
| UFOS | Martian ships, maybe: Abbr. |
| UFOS | Martian vehicles |
| UFOS | Martian vehicles, for short |
| UFOS | Martians' ships, for short |
| UFOS | Martians' vehicles |
| UFOS | Meteors, at times |
| UFOS | Mysterious Roswell sightings: Abbr. |
| UFOS | Mysterious aerial sightings: Abbr. |
| UFOS | Mysterious blips |
| UFOS | Mysterious hoverers in the sky: Abbr. |
| UFOS | Mysterious lights in the sky: Abbr. |
| UFOS | Mysterious night lights |
| UFOS | Mysterious objects in the sky claimed to belong to aliens: Abbr. |
| UFOS | Mysterious sci-fi ships |
| UFOS | Mysterious sci-fi ships: Abbr. |
| UFOS | Mysterious sightings |
| UFOS | Mysterious sightings in Roswell, New Mexico: Abbr. |
| UFOS | Mysterious sightings in the sky, for short |
| UFOS | Mysterious sightings in the sky: Abbr. |
| UFOS | Mysterious sightings that hover |
| UFOS | Mysterious sights in the night sky: Abbr. |
| UFOS | Mysterious sky sightings |
| UFOS | Mysterious sky sightings: Abbr. |
| UFOS | Mysterious spacecrafts: Abbr. |
| UFOS | Night light sources |
| UFOS | Night sightings |
| UFOS | Old tabloid fodder |
| UFOS | Otherworldly sightings in the sky: Abbr. |
| UFOS | Overhead mysteries |
| UFOS | Ozone oddities |
| UFOS | Phenomena featured in "Nope" and "The Day the Earth Stood Still," briefly |
| UFOS | Phenomena in "Mars Attacks!" and "Arrival," briefly |
| UFOS | Phenomena leading some to believe that we are not alone |
| UFOS | Popular tabloid subjects |
| UFOS | Possible alien ships |
| UFOS | Potential hoax subjects |
| UFOS | Project Blue Book subject |
| UFOS | Purported sightings in Roswell, New Mexico: Abbr. |
| UFOS | Really long-haul craft |
| UFOS | Rides for ETs |
| UFOS | Roswell sightings |
| UFOS | Roswell sightings, briefly |
| UFOS | SETI subjects |
| UFOS | Saturn vehicles? |
| UFOS | Saucers from space, for short |
| UFOS | Saucers in 9 Across novels |
| UFOS | Saucers in sci-fi: Abbr. |
| UFOS | Saucers in the sky: Abbr. |
| UFOS | Saucers, maybe |
| UFOS | Saucer-shaped alien vehicles: Abbr. |
| UFOS | Sci-fi airships |
| UFOS | Sci-fi craft |
| UFOS | Sci-fi crafts |
| UFOS | Sci-fi fleet |
| UFOS | Sci-fi fliers |
| UFOS | Sci-fi hoverers |
| UFOS | Sci-fi hoverers: Abbr. |
| UFOS | Sci-fi movie staples |
| UFOS | Sci-fi saucers |
| UFOS | Sci-fi saucers, for short |
| UFOS | Sci-fi saucers: Abbr. |
| UFOS | Sci-fi ships |
| UFOS | Sci-fi ships: Abbr. |
| UFOS | Sci-fi sightings |
| UFOS | Sci-fi spacecraft: Abbr. |
| UFOS | Sci-fi spacecrafts: Abbr. |
| UFOS | Sci-fi staples |
| UFOS | Sci-fi transports |
| UFOS | Sci-fi travelers, for short |
| UFOS | Sci-fi vehicles |
| UFOS | Sci-fi vehicles, for short |
| UFOS | Sci-fi vehicles: Abbr. |
| UFOS | Sc-fi movie staples |
| UFOS | Ships carrying ETs |
| UFOS | Ships flown by aliens (Abbr.) |
| UFOS | Ships flown by aliens, for short |
| UFOS | Ships from space, briefly |
| UFOS | Ships presumably flown by aliens (Abbr.) |
| UFOS | Ships that might be piloted by Martians: Abbr. |
| UFOS | Ships to a far-off place? |
| UFOS | Sightings of concern in JFK's control tower |
| UFOS | Sightings of them can be reported on the Enigma app |
| UFOS | Sightings the U.S.A.F. may investigate |
| UFOS | Sky lights, of a sort |
| UFOS | Sky lights? |
| UFOS | Sky line creators, perhaps |
| UFOS | Sky saucers |
| UFOS | Sky sightings |
| UFOS | Some 61 Across creators, for short |
| UFOS | Some blinking lights, for short |
| UFOS | Some fuzzy tabloid pics |
| UFOS | Some motherships in tabloids |
| UFOS | Some people believe swamp gas causes them, for short |
| UFOS | Some photographic blurs, supposedly |
| UFOS | Some sky lights |
| UFOS | Some sky lights, in brief |
| UFOS | Some strange sightings |
| UFOS | Some streaking lights, briefly |
| UFOS | Sources of some mysterious lights, perhaps |
| UFOS | Space invaders? |
| UFOS | Spooky crafts |
| UFOS | Spooky sightings |
| UFOS | Strange hoverers |
| UFOS | Strange lights in the sky, perhaps: Abbr. |
| UFOS | Strange sightings |
| UFOS | Strange sightings, for short |
| UFOS | Subjects of 58-Down investigations |
| UFOS | Subjects of Project Blue Book |
| UFOS | Subjects of a Roswell museum |
| UFOS | Subjects of a U.S. Air Force cover-up? |
| UFOS | Subjects of a top-secret government cover-up, some believe |
| UFOS | Subjects of many Skeptic articles |
| UFOS | Subjects of some 911 calls |
| UFOS | Subjects of some Area 51 conspiracy theories: Abbr. |
| UFOS | Subjects of some declassified Navy pilot videos |
| UFOS | Subjects of some eerie videos |
| UFOS | Subjects of some fuzzy photos, for short |
| UFOS | Subjects of some grainy pictures |
| UFOS | Supernatural tabloid fodder |
| UFOS | Tabloid fliers |
| UFOS | Tabloid hoverers |
| UFOS | Tabloid subjects, sometimes |
| UFOS | Tabloid topics |
| UFOS | Tabloids hoverers |
| UFOS | They often turn out to be just weather balloons or drones: Abbr. |
| UFOS | They travel very long distances |
| UFOS | They're encountered in "close encounters" |
| UFOS | They're involved in some reported abductions |
| UFOS | They're seen but not recognized |
| UFOS | Typically, they turn out to be military aircraft |
| UFOS | UAPs, formerly |
| UFOS | Unaccounted-for radar blips |
| UFOS | Unexplained hoverers |
| UFOS | Unexplained sightings |
| UFOS | Unexplained sightings in the sky, perhaps: Abbr. |
| UFOS | Unexplained sightings in the sky: Abbr. |
| UFOS | Unexplained sightings, for short |
| UFOS | Unsettling sightings |
| UFOS | Unusual aerial sightings: Abbr. |
| UFOS | Usually fuzzy tabloid pics |
| UFOS | Vehicles for ETs |
| UFOS | Vehicles for alien space travelers: Abbr. |
| UFOS | Vehicles for aliens, perhaps |
| UFOS | Vehicles from Venus?: Abbr. |
| UFOS | Vehicles in many sci-fi movies |
| UFOS | Vehicles in many tabloid stories |
| UFOS | Vehicles in some tabloid photos |
| UFOS | Vehicles that come from Neptune, maybe: Abbr. |
| UFOS | Vehicles that may or may not be stored in Area 51: Abbr. |
| UFOS | Vehicles that might be beamers? |
| UFOS | Vehicles that supposedly create crop circles: Abbr. |
| UFOS | Venusian fleet? |
| UFOS | Venusian vessels? |
| UFOS | Weird things seen in the sky: Abbr. |
| UFOS | What weather balloons may be mistaken for, for short |
| UFOS | Wormhole ships |
| UFOS | X-file topics |