N545ZS is taken. It's currently assigned to a Shield Ai Inc V-BAT registered in Frisco, TX.
See the full aircraft record →Checked against FAA data from Sep 21, 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.
N545ZS has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N545ZS that aren't assigned or reserved: