| Tail Number / N-Number | N321WM |
| Manufacturer | BEECH |
| Model | 58 |
| Year Built | 1975 |
| Manufacturer's Serial Number | TH-571 |
| Aircraft Type | Fixed wing multi 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 | 2 engines |
| Horsepower per Engine | 285 hp (213 kW) |
| Total Horsepower | 570 hp (425 kW) |
| Average Cruising Speed | 165 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | ISABELLA AVIATION CORP |
| Street | 251 LITTLE FALLS DR |
| City | WILMINGTON |
| State | DE |
| Zip Code | 19808-1674 |
| Region | Eastern |
| County | New Castle County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Certificate Issue Date | 2008-12-02 |
| Last Action Date | 2021-10-25 |
| Expiration Date | 2029-03-31 |
| Status | Valid Registration |
| Mode S Code | 50672007 |
| Mode S Code Hex | A37407 |