| Tail Number / N-Number | N121SJ |
| Manufacturer | ASHER CHARLES R |
| Model | KITFOX THREE III |
| Year Built | 1996 |
| Manufacturer's Serial Number | 1026 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | BOMBARDIER |
| Engine Model | ROTAX (ALL) |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Type of Registrant | Individual |
| Owner Name | WESTPHAL GERALD J |
| Street | N12461 COUNTY ROAD F |
| City | PHILLIPS |
| State | WI |
| Zip Code | 54555-7127 |
| Region | Great Lakes |
| County | Price County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1996-04-18 |
| Certificate Issue Date | 2019-07-22 |
| Last Action Date | 2022-05-21 |
| Expiration Date | 2029-07-31 |
| Status | Valid Registration |
| Mode S Code | 50054402 |
| Mode S Code Hex | A05902 |