| Tail Number / N-Number | N204BL |
| Manufacturer | ONEIL WILLIAM JEROME |
| Model | ONEIL BERKUT 360 |
| Year Built | 2012 |
| Manufacturer's Serial Number | WJO 003 |
| 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 | LYCOMING |
| Engine Model | IO-360-C1A |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 200 hp (149 kW) |
| Type of Registrant | Individual |
| Owner Name | O'NEIL WILLIAM JEROME |
| Street | 406 BASSWOOD AVE |
| City | RICHLAND |
| State | WA |
| Zip Code | 99352-4041 |
| Region | Northwest Mountain |
| County | Benton County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2012-08-09 |
| Certificate Issue Date | 2008-01-07 |
| Last Action Date | 2022-06-22 |
| Expiration Date | 2029-11-30 |
| Status | Valid Registration |
| Mode S Code | 50320403 |
| Mode S Code Hex | A1A103 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N204BL.
| Tail Number / N-Number | N204BL |
| Manufacturer | ONEIL WILLIAM J |
| Model | GLASAIR II-S |
| Year Built | 2001 |
| Manufacturer's Serial Number | WJO-2 |
| 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 | LYCOMING |
| Engine Model | O&VO-360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | ONEIL WILLIAM J |
| Street | 406 BASSWOOD AVE |
| City | RICHLAND |
| State | WA |
| Zip Code | 99352 |
| County | Benton County |
| Country | US |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2001-05-17 |
| Certificate Issue Date | 1994-10-27 |
| Last Action Date | 2006-11-21 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 2007-02-05 |