N676 is taken. It's currently assigned to a 1973 Glasflugel STD LIBELLE 201B registered in Frankfort, IN.
See the full aircraft record →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.
N676 has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N676 that aren't assigned or reserved: