N8729T is taken. It's currently assigned to a 1960 Cessna 182C registered in Pine Brook, NJ.
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.
N8729T has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N8729T that aren't assigned or reserved: