| Tail Number / N-Number | N129SX |
| Manufacturer | DELIUS STEVEN E |
| Model | SONEX |
| Year Built | 2009 |
| Manufacturer's Serial Number | 475 |
| 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 | SAWYER GARY L |
| Street | 437 LAS RIENDAS DR |
| City | FULLERTON |
| State | CA |
| Zip Code | 92835-1307 |
| Region | Western-Pacific |
| County | Orange County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2009-09-30 |
| Certificate Issue Date | 2020-10-24 |
| Last Action Date | 2020-10-24 |
| Expiration Date | 2027-10-31 |
| Status | Valid Registration |
| Mode S Code | 50073307 |
| Mode S Code Hex | A076C7 |