| Tail Number / N-Number | N21SD |
| Manufacturer | STEPHEN C BRYANT |
| Model | SD2 |
| Manufacturer's Serial Number | SD2-1 |
| 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) |
| Number of Engines | 1 engine |
| Type of Registrant | Individual |
| Owner Name | BRYANT STEPHEN C |
| Street | 4802 MALIBU RD |
| City | ANCHORAGE |
| State | AK |
| Zip Code | 99517-3274 |
| Region | Alaskan |
| County | Anchorage Municipality |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2021-03-25 |
| Last Action Date | 2021-03-25 |
| Expiration Date | 2028-03-31 |
| Status | Valid Registration |
| Mode S Code | 50334275 |
| Mode S Code Hex | A1B8BD |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N21SD.
| Tail Number / N-Number | N21SD |
| Manufacturer | AERO COMMANDER |
| Model | 680FL |
| Manufacturer's Serial Number | 1417-65 |
| 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) |
| Engine Manufacturer | LYCOMING |
| Engine Model | IGSO-540-B1A |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 380 hp (283 kW) |
| Total Horsepower | 760 hp (567 kW) |
| Average Cruising Speed | 188 miles per hour |
| Type of Registrant | Individual |
| Owner Name | MOORE S DAVID |
| Street | 7087 HILCROFT WAY |
| City | LAS VEGAS |
| State | NV |
| Zip Code | 89117 |
| County | Anchorage Municipality |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1964-03-30 |
| Certificate Issue Date | 1994-03-02 |
| Last Action Date | 2000-03-30 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2013-07-18 |