Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N256S.
| Tail Number / N-Number | N256S |
| Manufacturer | MARTIN |
| Model | 404 |
| Year Built | 1952 |
| Manufacturer's Serial Number | 14236 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 52 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Engine Manufacturer | P & W |
| Engine Model | R-2800 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 2,000 hp (1,492 kW) |
| Total Horsepower | 4,000 hp (2,984 kW) |
| Average Cruising Speed | 210 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | SALE REPORTED |
| Street | P. O. BOX 25082 |
| City | OKLAHOMA CITY |
| State | OK |
| Zip Code | 73125 |
| Country | US |
| Airworthiness Classification | Standard |
| Last Action Date | 1977-01-14 |
| Last Status | Sale reported |
| Cancellation Date | 1974-07-11 |
| Mode S Code | 50467530 |
| Mode S Code Hex | A26F58 |