| Tail Number / N-Number | N21039 |
| Manufacturer | AERONCA |
| Model | 65-LA |
| Year Built | 1938 |
| Manufacturer's Serial Number | KM-4 |
| 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 | LYCOMING |
| Engine Model | 0-145B SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 65 hp (48 kW) |
| Average Cruising Speed | 75 miles per hour |
| Type of Registrant | Individual |
| Owner Name | HERZOG ERIC M |
| Street | 128 LONG HORN LOOP |
| City | NEW WAVERLY |
| State | TX |
| Zip Code | 77358-3737 |
| Region | Southwestern |
| County | Walker County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1962-08-22 |
| Certificate Issue Date | 2008-09-16 |
| Last Action Date | 2021-03-31 |
| Expiration Date | 2028-04-30 |
| Status | Valid Registration |
| Mode S Code | 50336145 |
| Mode S Code Hex | A1BC65 |