| Tail Number / N-Number | N4321 |
| Manufacturer | CURTISS WRIGHT |
| Model | TRAVEL AIR 4000 |
| Year Built | 1930 |
| Manufacturer's Serial Number | 374 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 3 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | R680 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 215 hp (160 kW) |
| Average Cruising Speed | 79 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | STUART S MACPHERSON DDS INC |
| Street | PO BOX 807 |
| City | CARDIFF BY THE SEA |
| State | CA |
| Zip Code | 92007-0807 |
| Region | Western-Pacific |
| County | San Diego County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1974-06-24 |
| Certificate Issue Date | 1981-09-19 |
| Last Action Date | 2020-11-18 |
| Expiration Date | 2028-04-30 |
| Status | Valid Registration |
| Mode S Code | 51226407 |
| Mode S Code Hex | A52D07 |