N920 is taken. It's currently assigned to a 1983 Schleicher ASW-20B registered in Klamath Falls, OR.
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.
N920 has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N920 that aren't assigned or reserved: