| Tail Number / N-Number | N104SY |
| Manufacturer | STEPHEN L YOHO |
| Model | SONEX ONEX |
| Year Built | 2016 |
| Manufacturer's Serial Number | 0104 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | SONEX |
| Engine Model | AEROVEE 2.1 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 80 hp (60 kW) |
| Kit Manufacturer | SONEX AIRCRAFT LLC |
| Kit Model | ONEX |
| Type of Registrant | Individual |
| Owner Name | YOHO STEPHEN L |
| Street | 2199 MELDAHL RD |
| City | WASHINGTON |
| State | WV |
| Zip Code | 26181-6372 |
| Region | Eastern |
| County | Wood County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2019-05-17 |
| Certificate Issue Date | 2016-07-06 |
| Last Action Date | 2022-02-19 |
| Expiration Date | 2029-07-31 |
| Status | Valid Registration |
| Mode S Code | 50012467 |
| Mode S Code Hex | A01537 |