Related Clues:
- Subjects of a top-secret government cover-up, some believe
- They may come up from boundaries of Uranus
- Hover craft?
- These recalled lots of unsolved cases?
- Craft some try to reverse-engineer, in the movies
- Mysterious objects
- Whether they're up in the air is up in the air
- Carriers for little green men
- Saucers in the sky
- Abominable snowmen (for the sake of this puzzle imagine there are more than one)
- Telescopes of universities partially looking up for them
- Fabled mountain dwellers
- ET vehicles
- Air Force enigmas
- Cryptids of the Indian subcontinent