N400DU is reserved. Fee-paid reservation held by Delta Air Lines Inc — if it isn't renewed, the FAA releases it on Aug 2, 2027 (in about 12 months).
Checked against FAA data from Jul 27, 2026. Not an official FAA determination — always confirm with the FAA before filing.
Reserved by an individual or company for $10 per year.
Reservations lapse more often than you'd think. Check back around Aug 2, 2027 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in August 2027.
N400DU has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N400DU that aren't assigned or reserved: