N51SD is reserved. Fee-paid reservation held by Spencer Duke — if it isn't renewed, the FAA releases it on Feb 27, 2027 (in about 8 months).
Reserved by an individual or company for $10 per year.
Reservations lapse more often than you'd think. Check back around Feb 27, 2027 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in February 2027.
N51SD has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N51SD that aren't assigned or reserved: