N630TS is taken. It's currently assigned to a 2013 Dassault Aviation FALCON 7X registered in Miami, FL.
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.
N630TS has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N630TS that aren't assigned or reserved: