| Tail Number / N-Number | N99121 |
| Manufacturer | ERCOUPE |
| Model | 415-D |
| Year Built | 1946 |
| Manufacturer's Serial Number | 1744 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | A&C75 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 75 hp (56 kW) |
| Average Cruising Speed | 90 miles per hour |
| Type of Registrant | Individual |
| Owner Name | SPROTT ROBERT L |
| Street | 14718 S HIGHWAY 177 |
| City | PERKINS |
| State | OK |
| Zip Code | 74059-4307 |
| Region | Southwestern |
| County | Payne County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1968-09-30 |
| Certificate Issue Date | 2016-09-19 |
| Last Action Date | 2022-04-26 |
| Expiration Date | 2029-09-30 |
| Status | Valid Registration |
| Mode S Code | 53354422 |
| Mode S Code Hex | ADD912 |