| Tail Number / N-Number | N861SX |
| Manufacturer | LARSON WILLIAM E |
| Model | SONEX |
| Year Built | 2011 |
| Manufacturer's Serial Number | 0861 |
| 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 | AEROVEE |
| Engine Model | 2180 |
| Engine Type | 4 Cycle |
| Number of Engines | 1 engine |
| Horsepower | 80 hp (60 kW) |
| Kit Manufacturer | SONEX AIRCRAFT LLC |
| Kit Model | SONEX |
| Type of Registrant | Individual |
| Owner Name | LARSON WILLIAM E |
| Street | 2021 W MURPHY DR |
| City | DUNLAP |
| State | IL |
| Zip Code | 61525-9406 |
| Region | Great Lakes |
| County | Peoria County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2011-10-15 |
| Certificate Issue Date | 2011-05-13 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-05-31 |
| Status | Valid Registration |
| Mode S Code | 52752064 |
| Mode S Code Hex | ABD434 |