Airthorns are flying mechanoids created by the Luminoth to patrol local airspace. They travel in packs for safety. Their size and speed made them especially useful until their programming failed and they went rogue.
Airthorns only appear in the Dark Transit Station, and because Samus can only traverse that room while in Morph Ball mode, they cannot be scanned during normal gameplay. The planned scan data still exists in the game data, however.
- "Mechanism: Airthorns
Rogue airborne mechanoids.
Targets are small and travel in packs for safety. Avoid contact.
The Luminoth made the Airthorn to patrol local airspace. The small, speedy machines were a boon to the war effort until their programming failed. Now rogue, they serve the Ing as fiercely as they served their creators." —Unused Logbook Entry (Metroid Prime 2: Echoes)