| Tail Number / N-Number | N551XP |
| Manufacturer | RICHARD A FOSS |
| Model | ONEX |
| Manufacturer's Serial Number | ONX0055 |
| 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) |
| Number of Engines | 1 engine |
| Kit Manufacturer | SONEX AIRCRAFT LLC |
| Kit Model | ONEX |
| Type of Registrant | Individual |
| Owner Name | FOSS RICHARD A |
| Street | 12046 MARYLAND MANOR DR |
| City | MARYLAND HEIGHTS |
| State | MO |
| Zip Code | 63043-1182 |
| Region | Central |
| County | St. Louis County |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2022-05-26 |
| Last Action Date | 2022-05-26 |
| Expiration Date | 2029-05-31 |
| Status | Valid Registration |
| Mode S Code | 51602475 |
| Mode S Code Hex | A7053D |