| Tail Number / N-Number | N857SX |
| Manufacturer | ACHESON SEAN M |
| Model | SONEX |
| Year Built | 2016 |
| Manufacturer's Serial Number | 857 |
| 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 | AMA/EXPR |
| Engine Model | UNKNOWN ENG |
| Number of Engines | 1 engine |
| Kit Manufacturer | SONEX LTD |
| Kit Model | SONEX |
| Type of Registrant | Individual |
| Owner Name | ACHESON SEAN M |
| Street | N5222 DELANEY RD |
| City | DELAVAN |
| State | WI |
| Zip Code | 53115-2774 |
| Region | Great Lakes |
| County | Walworth County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2016-04-22 |
| Certificate Issue Date | 2016-04-05 |
| Last Action Date | 2022-02-13 |
| Expiration Date | 2029-04-30 |
| Status | Valid Registration |
| Mode S Code | 52741377 |
| Mode S Code Hex | ABC2FF |