N866GD is taken. It's currently assigned to a 2025 Gulfstream Aerospace Corp GVIII-G700 registered in Wilmington, DE.
See the full aircraft record →Checked against FAA data from Aug 23, 2026. Not an official FAA determination — always confirm with the FAA before filing.
A tail number only frees up if the owner deregisters the aircraft or moves it to a different N-number — and even then the FAA holds it before releasing it to the public.
Tails one nudge away from N866GD that aren't assigned or reserved: