| Tail Number / N-Number | N4321S |
| Manufacturer | BEECH |
| Model | S35 |
| Year Built | 1964 |
| Manufacturer's Serial Number | D-7512 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 6 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | IO 520 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 285 hp (213 kW) |
| Average Cruising Speed | 150 miles per hour |
| Type of Registrant | LLC |
| Owner Name | BEECH PEAK AVIATION LLC |
| Street | PO BOX 3143 |
| City | NEDERLAND |
| State | CO |
| Zip Code | 80466-3143 |
| Region | Northwest Mountain |
| County | Boulder County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1964-07-01 |
| Certificate Issue Date | 2021-01-23 |
| Last Action Date | 2021-01-23 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 51226430 |
| Mode S Code Hex | A52D18 |