N4521H is reserved. Fee-paid reservation held by Airside Integrations — if it isn't renewed, the FAA releases it on Mar 11, 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 Mar 11, 2027 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in March 2027.
N4521H has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N4521H that aren't assigned or reserved: