| Tail Number / N-Number | N21DD |
| Manufacturer | MOONEY |
| Model | M20E |
| Year Built | 1965 |
| Manufacturer's Serial Number | 895 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | I0360 SER A&C |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 200 hp (149 kW) |
| Average Cruising Speed | 127 miles per hour |
| Type of Registrant | Individual |
| Owner Name | HAM ARTHUR J |
| Street | 444 ANCHOR LN |
| City | GUN BARREL CITY |
| State | TX |
| Zip Code | 75156-5624 |
| Region | Southwestern |
| County | Henderson County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1965-11-09 |
| Certificate Issue Date | 2018-01-19 |
| Last Action Date | 2020-09-14 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 50333570 |
| Mode S Code Hex | A1B778 |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N21DD.
| Tail Number / N-Number | N21DD |
| Manufacturer | BEECH |
| Model | E18S |
| Manufacturer's Serial Number | BA-369 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 10 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 165 miles per hour |
| Type of Registrant | Individual |
| Owner Name | FORD ROBERT H |
| Street | 1912 CRESCENT DRIVE |
| City | MUSCLE SHOALS |
| State | AL |
| Zip Code | 35660 |
| Region | Southern |
| County | Henderson County |
| Certificate Issue Date | 1971-10-20 |
| Last Status | Valid Registration |
| Cancellation Date | 1973-06-26 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N21DD.
| Tail Number / N-Number | N21DD |
| Manufacturer | DOYLE |
| Model | SCORPION TOO |
| Manufacturer's Serial Number | 7894 |
| Aircraft Type | Rotorcraft |
| 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 |
| Average Cruising Speed | 45 miles per hour |
| Type of Registrant | Individual |
| Owner Name | DELLOW DOYLE |
| Street | 8485 PLANETARY DR |
| City | BUENA PARK |
| State | CA |
| Zip Code | 90620 |
| Region | Western-Pacific |
| County | Henderson County |
| Last Status | Valid Registration |
| Cancellation Date | 1977-02-07 |