Related Clues:
- Aeroplane managed to cross river
- Monotonous (or rhythmic) sound
- Go on and on, with "on"
- Extremes of hunger involved in stomach rumbling?
- Craft regulated by the FAA
- Source of some aerial photos
- Unmanned aerial vehicle
- Skycam carrier, perhaps
- Airborne strike source
- Remotely controlled flier
- Track 2 on Panda Bear's "Tomboy"
- Effect of one sound throughout piece
- Remote controlled craft
- Remote-control aircraft
- Bee with no sting