| Tail Number / N-Number | N1557G |
| Manufacturer | CESSNA |
| Model | 421B |
| Year Built | 1974 |
| Manufacturer's Serial Number | 421B0653 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | IO 520 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 285 hp (213 kW) |
| Total Horsepower | 570 hp (425 kW) |
| Average Cruising Speed | 172 miles per hour |
| Type of Registrant | LLC |
| Owner Name | WIND RIVER AVIATION LLC |
| Street | 410 SW TEXAS AVE |
| City | LAWTON |
| State | OK |
| Zip Code | 73501-4617 |
| Region | Southwestern |
| County | Comanche County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1974-09-09 |
| Certificate Issue Date | 2016-07-21 |
| Last Action Date | 2022-02-14 |
| Expiration Date | 2029-07-31 |
| Status | Valid Registration |
| Mode S Code | 50160026 |
| Mode S Code Hex | A0E016 |