Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4257U.
| Tail Number / N-Number | N4257U |
| Manufacturer | LOCKHEED |
| Model | C-121T |
| Manufacturer's Serial Number | 52-3418 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 112 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Number of Engines | 4 engines |
| Type of Registrant | Corporation |
| Owner Name | COMBAT AIR MUSEUM INC |
| Street | PO BOX 19142 HNG 602 FORBES FLD |
| City | TOPEKA |
| State | KS |
| Zip Code | 66619 |
| Country | US |
| Certificate Issue Date | 1981-07-02 |
| Last Action Date | 2009-05-19 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2012-12-18 |
| Mode S Code | 51210622 |
| Mode S Code Hex | A51192 |