N421MM is reserved. Fee-paid reservation held by Michael Maresca — if it isn't renewed, the FAA releases it on Jul 19, 2027 (in about 13 months).
Reserved by an individual or company for $10 per year.
Reservations lapse more often than you'd think. Check back around Jul 19, 2027 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in July 2027.
N421MM has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N421MM that aren't assigned or reserved: