| Tail Number / N-Number | N421LL |
| Manufacturer | CESSNA |
| Model | 421C |
| Year Built | 1983 |
| Manufacturer's Serial Number | 421C1081 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | GTSIO-520 SER |
| Engine Type | Turbo-prop |
| Number of Engines | 2 engines |
| Horsepower per Engine | 435 hp (325 kW) |
| Total Horsepower | 870 hp (649 kW) |
| Average Cruising Speed | 90 miles per hour |
| Type of Registrant | LLC |
| Owner Name | WHIRLYBIRD AVIATION LLC |
| Street | 591 SW MILL VIEW WAY |
| City | BEND |
| State | OR |
| Zip Code | 97702-1231 |
| Region | Northwest Mountain |
| County | Deschutes County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1983-10-12 |
| Certificate Issue Date | 2012-05-25 |
| Last Action Date | 2021-02-22 |
| Expiration Date | 2028-05-31 |
| Status | Valid Registration |
| Mode S Code | 51200133 |
| Mode S Code Hex | A5005B |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N421LL.
| Tail Number / N-Number | N421LL |
| Manufacturer | CESSNA |
| Model | 421C |
| Manufacturer's Serial Number | 421C0305 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 90 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | DAVID DRYE COMPANY LLC |
| Street | 170 DAVIDSON HWY |
| City | CONCORD |
| State | NC |
| Zip Code | 28027-4206 |
| County | Deschutes County |
| Country | US |
| Certificate Issue Date | 1998-12-07 |
| Last Action Date | 2001-12-18 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 2002-03-20 |