| Tail Number / N-Number | N4521L |
| Manufacturer | GULFSTREAM AMERICAN CORP |
| Model | AA-5B |
| Manufacturer's Serial Number | AA5B1072 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | O&VO-360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Corporation |
| Owner Name | CARMARTHEN CORP |
| Street | 6003 E 117TH PL |
| City | TULSA |
| State | OK |
| Zip Code | 74137 |
| Region | Southwestern |
| County | Tulsa County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1979-01-26 |
| Certificate Issue Date | 2022-10-27 |
| Last Action Date | 2022-10-27 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 51276020 |
| Mode S Code Hex | A57C10 |