| Tail Number / N-Number | N251B |
| Manufacturer | SCHLEICHER |
| Model | ASW-20 |
| Year Built | 1979 |
| Manufacturer's Serial Number | 20274 |
| Aircraft Type | Glider |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | NONE |
| Engine Model | NONE |
| Number of Engines | 0 engines |
| Type of Registrant | Individual |
| Owner Name | ANKLAM THOMAS M |
| Street | 11890 W VOMAC RD |
| City | DUBLIN |
| State | CA |
| Zip Code | 94568-1049 |
| Region | Western-Pacific |
| County | Alameda County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1980-05-15 |
| Certificate Issue Date | 2017-12-27 |
| Last Action Date | 2020-07-13 |
| Expiration Date | 2027-12-31 |
| Status | Valid Registration |
| Mode S Code | 50455516 |
| Mode S Code Hex | A25B4E |
Deregistered Aircraft 1 of 3. This aircraft was previously assigned the N-number N251B.
| Tail Number / N-Number | N251B |
| Manufacturer | AERO COMMANDER |
| Model | 680T |
| Year Built | 1966 |
| Manufacturer's Serial Number | 1587 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 11 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 188 miles per hour |
| Type of Registrant | Individual |
| Owner Name | DEAN JOHN H |
| Street | 4309 WINDING WAY |
| City | FORT WORTH |
| State | TX |
| Zip Code | 76116 |
| Region | Southwestern |
| County | Alameda County |
| Country | US |
| Certificate Issue Date | 1976-03-05 |
| Last Status | Valid Registration |
| Cancellation Date | 1977-11-25 |
| Exported To | CANADA |
Deregistered Aircraft 2 of 3. This aircraft was previously assigned the N-number N251B.
| Tail Number / N-Number | N251B |
| Manufacturer | COLONIAL |
| Model | C-1 |
| Manufacturer's Serial Number | 11 |
| Aircraft Type | Fixed wing single engine |
| Category | Amphibian |
| Builder Certification | Type Certificated |
| Number of Seats | 3 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 84 miles per hour |
| Type of Registrant | Individual |
| Owner Name | POWERS WILLIAM J |
| Street | 25 CORINTHIAN COURT |
| City | TIBURON |
| State | CA |
| Zip Code | 94920 |
| Region | Western-Pacific |
| County | Alameda County |
| Certificate Issue Date | 1963-08-02 |
| Last Status | Valid Registration |
| Cancellation Date | 1964-07-21 |
| Exported To | CANADA |
Deregistered Aircraft 3 of 3. This aircraft was previously assigned the N-number N251B.
| Tail Number / N-Number | N251B |
| Manufacturer | PIPER |
| Model | AEROSTAR 601P |
| Manufacturer's Serial Number | 61P08128063422 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 6 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Type of Registrant | Individual |
| Owner Name | HEGG MARK |
| Street | 3880 BIRCHWOOD DR |
| City | BOULDER |
| State | CO |
| Zip Code | 80304-1419 |
| County | Alameda County |
| Country | US |
| Last Action Date | 1996-04-17 |
| Last Status | Valid Registration |
| Cancellation Date | 1998-09-28 |