| Tail Number / N-Number | N21021 |
| Manufacturer | AERONCA |
| Model | KCA |
| Year Built | 1938 |
| Manufacturer's Serial Number | KCA6 |
| 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 | A50 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 50 hp (37 kW) |
| Average Cruising Speed | 71 miles per hour |
| Type of Registrant | Individual |
| Owner Name | STEWART DONALD M |
| Street | W8923 N LAKE RD |
| City | VULCAN |
| State | MI |
| Zip Code | 49892 |
| Region | Great Lakes |
| County | Dickinson County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1954-08-14 |
| Certificate Issue Date | 1976-04-13 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-04-30 |
| Status | Valid Registration |
| Mode S Code | 50336072 |
| Mode S Code Hex | A1BC3A |