| Tail Number / N-Number | N21821 |
| Manufacturer | PIPER |
| Model | J3C-65 |
| Year Built | 1939 |
| Manufacturer's Serial Number | 2617 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | A&C65 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 65 hp (48 kW) |
| Average Cruising Speed | 67 miles per hour |
| Type of Registrant | Individual |
| Owner Name | RETTICK JAMES M |
| Street | 8674 RETTICK LN |
| City | BLOOMINGTON |
| State | IL |
| Zip Code | 61704-9294 |
| Region | Great Lakes |
| County | McLean County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1956-05-31 |
| Certificate Issue Date | 2000-08-08 |
| Last Action Date | 2020-08-21 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 50354762 |
| Mode S Code Hex | A1D9F2 |