N40129 is reserved. Manufacturer temporary reservation held by Boeing Co — if it isn't renewed, the FAA releases it on Nov 26, 2029 (in about 3.4 years).
Checked against FAA data from Jul 1, 2026. Not an official FAA determination — always confirm with the FAA before filing.
Temporarily reserved to an aircraft manufacturer.
Reservations lapse more often than you'd think. Check back around Nov 26, 2029 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in November 2029.
N40129 has been worn before. Past registrations from FAA deregistration records: