N99AU is taken. It's currently assigned to a Aurora Flight Sciences Corp ODYSSEUS registered in Manassas, VA.
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.
N99AU has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N99AU that aren't assigned or reserved: