N51921 is reserved. Post-cancellation hold held by Cancelled/Not Assigned — if it isn't renewed, the FAA releases it on Feb 15, 2027 (in about 8 months).
This tail was recently cancelled. The FAA holds cancelled N-numbers before releasing them back to the public.
Reservations lapse more often than you'd think. Check back around Feb 15, 2027 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in February 2027.
N51921 has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N51921 that aren't assigned or reserved: