| Tail Number / N-Number | N640DF |
| Manufacturer | BEECH |
| Model | C90A |
| Year Built | 1992 |
| Manufacturer's Serial Number | LJ-1312 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 9 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | P&W CANADA |
| Engine Model | PT6A-6 SERIES |
| Engine Type | Turbo-prop |
| Number of Engines | 2 engines |
| Horsepower per Engine | 950 hp (709 kW) |
| Total Horsepower | 1,900 hp (1,417 kW) |
| Type of Registrant | Co-Ownership |
| Owner Name | WHY NOT LLC |
| Other Names |
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| Street | 26503 11 RD |
| City | MONTEZUMA |
| State | KS |
| Zip Code | 67867-9065 |
| Region | Central |
| County | Gray County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1992-09-30 |
| Certificate Issue Date | 2015-01-16 |
| Last Action Date | 2020-09-01 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 52062614 |
| Mode S Code Hex | A8658C |