N804WA is taken. It's currently assigned to a 1987 Mcdonnell Douglas DC-9-83(MD-83) 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.
N804WA has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N804WA that aren't assigned or reserved: