| Tail Number / N-Number | N21SS |
| Manufacturer | CESSNA |
| Model | 421C |
| Year Built | 1978 |
| Manufacturer's Serial Number | 421C0473 |
| 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 | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 300 hp (224 kW) |
| Total Horsepower | 600 hp (448 kW) |
| Average Cruising Speed | 90 miles per hour |
| Type of Registrant | Co-Ownership |
| Owner Name | 21GO LLC |
| Other Names |
|
| Street | PO BOX 792 |
| City | BELLEFONTAINE |
| State | OH |
| Zip Code | 43311-0792 |
| Region | Great Lakes |
| County | Logan County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1998-06-02 |
| Certificate Issue Date | 2022-10-11 |
| Last Action Date | 2022-10-11 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 50334312 |
| Mode S Code Hex | A1B8CA |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N21SS.
| Tail Number / N-Number | N21SS |
| Manufacturer | RAVEN |
| Model | S-50A |
| Manufacturer's Serial Number | S50A236 |
| Aircraft Type | Balloon |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 0 engines |
| Average Cruising Speed | 60 miles per hour |
| Type of Registrant | Individual |
| Owner Name | CUNNINGHAM C WILLIAM |
| Street | 8145 CREEKSIDE CIRCLE N |
| City | CORDOVA |
| State | TN |
| Zip Code | 38018 |
| County | Logan County |
| Country | US |
| Certificate Issue Date | 1989-07-18 |
| Last Action Date | 1995-06-21 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 1995-11-21 |